Before I make any online purchase, I always check with sites like RetailMeNot.com, which will tell me if there are any promo codes or coupons associated with a prospective purchase. I just scored 31% off an upcoming whale watching cruise with Groupon. I also get on rewards lists for stores I frequent, so I get daily emails of what's on sale. Finally, definitely use FatWallet.com when you want to make a purchase of something more pricey than groceries and see if there are any great bargains around.
I didn’t know about the other one, thanks. Am I gonna get spammed?