UPDATE 2-U.S. shoppers buy earlier this holiday season

* Mobile shopping on rise, Apple's iPad leads the way

* Many people spend less and buy fewer items online

* Shipping costs could eat into retailers' profits

CHICAGO/SAN FRANCISCO, Nov 24 (Reuters) - Online shopping

has grown sharply so far this holiday shopping season after U.S.

retailers pushed out a slew of mobile and Internet deals that

lured consumers before Cyber Monday, traditionally the biggest

day for e-commerce in America.

While it remains to be seen if the gains over Thanksgiving

Day and Black Friday can be sustained, the latest estimates show

shoppers scooping up early special offers via their smart phones

and tablets, the way they used to hunt for bargains in

brick-and-mortar stores.

Online sales increased 17.4 percent on Thanksgiving and 20.7

percent on Black Friday, compared with 2011, according to IBM

Smarter Commerce, a unit of International Business Machines Corp

that analyzes transactions from 500 U.S. retailers.

Black Friday, the day after Thanksgiving, had traditionally

been the kickoff to the holiday season for stores. This year,

retailers such as Wal-Mart Stores Inc. and Target Corp.

made their biggest push ever with special offers during

the holiday itself.

"The Thanksgiving creep revitalized the thrill for people,"

said Wendy Liebmann, chief executive of WSL Strategic Retail.

"It got people excited to go out. But it pulled a lot of sales

forward."

Visits to stores rose 3.5 percent on Friday, down from a 4.7

percent increase last year, ShopperTrak estimated.

Sales actually fell an estimated 1.8 percent, the company,

which analyzes store traffic, said. But if Thursday sales were

added in, ShopperTrak estimates that "Black Friday" sales would

have been up a little less than 1 percent from a year earlier.

"It's not a superstar Black Friday, but it also wasn't an

underperform Black Friday," said Ed Marcheselli, chief marketing

officer of ShopperTrak.

ONLINE SHIFT

Cyber Monday, which follows the long holiday weekend, has

been the biggest day for online shopping in recent years, as

workers return to their office computers.

Now, armed with mobile devices, particularly Apple Inc's

iPad and iPhone, shoppers are no longer waiting. They

are also using the devices to track down the lowest prices.

The average order value on Black Friday declined by 4.7

percent to $181.22, and the average number of items per order

dropped 12 percent to 5.6, according to IBM.

Client sales on Black Friday rose 23 percent from last year,

while Thanksgiving sales rose 32 percent year over year,

estimated Mercent, which helps merchants sell more on websites

including Amazon.com, ebay.com and Google Inc's online

shopping program.

"What we don't know is whether this is a zero-sum game or

whether there is some benefit to retailers by broadening the

holiday shopping window," Best said. "There is risk that real

growth in retail for the entire holiday may be overestimated

based on these early numbers."

E-commerce software firm ChannelAdvisor said clients'

same-store sales on eBay's online marketplace rose 27 percent on

Thanksgiving and 31 percent on Black Friday, compared with a

year earlier.

Last year's year-over-year growth was about 15 percent for

eBay, ChannelAdvisor said.

"The online players are definitely participating more on

Thanksgiving and Black Friday, so Cyber Monday is being shared

with other holidays now," said Scot Wingo, chief executive

ChannelAdvisor.

EBay usually grows more slowly early in the holiday season

and then ramps up later as retailers run out of hot products and

shoppers turn to eBay sellers for those items.

Its strong start this year is driven partly by the company's

success in attracting mobile shoppers through shopping apps on

smart phones and tablets, Wingo said.

EBay said on Saturday that the volume of mobile transactions

on its online marketplace jumped 153 percent on Black Friday,

compared with a year earlier. PayPal, the payments division of

eBay, saw Black Friday volume almost triple, year over year.

More broadly, purchases from mobile devices accounted for

16.3 percent of online sales on Black Friday, up from 9.8

percent in 2011 and 3.2 percent in 2010, according to IBM data.

Apple Inc's iPads and iPhones led the charge, with owners using

the devices to browse and buy on retailer websites.

SHOPPERS 'WANT TO SPEND'

Overall, the percentage of sales from online shopping is

expected to rise. But while retailers bring in more revenue from

online shopping, they may also face some higher costs in terms

of shipping a larger number of packages to more shoppers.

Among tablets, iPads were the clear leader, generating 88.3

percent of traffic to retailers' sites on Friday, followed by

Barnes & Noble Inc's Nook with 3.1 percent, Amazon.com

Inc's Kindle with 2.4 percent and the Samsung

Galaxy with 1.8 percent, IBM said.

At the mall, stores continued to use discounts to lure

shoppers on Saturday, with Aeropostale Inc discounting

items as much as 70 percent after a storewide 60 percent

discount on Friday.

Rival American Eagle Outfitters Inc continued its

two-day sale at 40 percent off, and Gap Inc's namesake

chain was offering 60 percent discounts for the entire weekend.

"The discounts were reasonable but didn't take your breath

away," said Liebmann. "Retailers are being cautious."

The Garden State Plaza Mall in Paramus, New Jersey, appeared

to be crowded on Saturday, although much quieter than on Black

Friday, clerks at several stores said.

Vanessa Crenshaw, a 45-year-old accountant shopping at JC

Penney, said that if stores pulled back on discounts,

she would go elsewhere.

"You can always find a deal, someone will have a deal," she

said.

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