Safety in numbers: collective buying is a growing trend

Warehouse clubs have introduced millions to low prices via buying in bulk, but applying the power of the group is now getting discounts on everything from restaurants to sporting events.

I stumbled upon Groupon fairly recently. One of those "heard it from a friend who heard it from a friend" kind of things. I don't usually go for coupons, too many hoops to jump through, but one buy and I was hooked.