If certain number of people sign up for a offer in a day, then they get the deal from local business. There is a website called groupon.com in US. It could have potential in some of the Canadian cities like Toronto, I think.
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There is a new online discount sweeping the country this holiday season -- groupons or group coupons.

It is a revolutionary new service from groupon.com, where collective buying power means big savings for online bargain hunters.

"I've already got Christmas done this year, and I didn't have to go anywhere. They are all from Groupon," frequent groupon user Lisa English said.

English checks Groupon.com's daily offers every morning for the deals, which can mean as much as 80 percent off the original price.

http://abcnews.go.com/GMA/ConsumerNews/online-shopping-deals-groupons-group-coupons/story?id=9201958

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