Fatwallet.com has a viral marketing system where
you can get cash back from referring people to the deals on their site. One of the guys
I work with says you can arrange deals there where you can get back in rebates and
other deals more than you paid for items. It's not as good as it once was, because
retailers are catching on, but coupons plus cash back situations plus other deals
can still make what you shop for far cheaper. It's a time vs. money tradeoff.

For example I can see my favorite bluetooth headset, the BlueAnt on sale for 80% off here.

I haven't actually used the site yet, I just heard about it, but I'm tempted. Happy Saving!