The person who mentioned
evreward.com sounded kinda like they work for the company or something, but I'll second their recommendation. You can quickly see how much each rebate site gives for a specific retailer.
I do use several rebate sites (Upromise, Ebates, MrRebates, Fatwallet). I like different things about each one. I also like MrRebates because of the size of the rebates, but I only accumulate enough to cash out about once a year--unless I buy plane tickets, which gives me enough to cash out right away. I have a nice trickle of referral income from MrRebates, too, because I have an affiliate link up on my blog. Fatwallet lets you cash out with any amount, which is nice. Upromise has super low rebates, but my spouse is only willing to use one site and he has a membership at Upromise, so a couple times a year he buys something online and we get a Upromise kickback into DS's college fund.
I don't shop online very much, and I know which of my regular places offer rebates, so it is pretty easy for me to click through from some site or other.
Favorite trick: If I am buying a wedding gift, I find out where the couple is registered. Instead of buying something on their registry, I buy them a gift certificate to that store. I know they like the stuff there if they registered there, and chances are they will not get everything on their registry. If possible, I buy the gift certificate from giftcertificates.com via Fatwallet or something, and get a rebate for it. (Try searching on Evreward for giftcertificates.com). I buy the gift certificate with my credit card, so there's another 1.5% rebate.
Am I cheapskate for wanting to get a small rebate when I buy somebody a wedding gift? Maybe.
