Where do people get the coupons on "extreme couponing" and is walmart a store that allows "extreme couponing?"?
Probably through a mixture of taking their friends Sunday paper-coupon sections, internet coupons, and store coupons.
And no, Walmart doesn't allow you to double and triple coupons like some places do. (Usually Kroger, Harris Teeter, and Food Lion do...but usually only like once a month or so.