Discounted Gift Cards Website

I recently discovered the website plasticjungle.com.
I think this will be a great website to remember when my boyfriend and I do some work around the house this upcoming summer. From reviews, it is a website that you can sell gift cards on to receive some cash back, and the buyers can receive a discount from about 3-12%.
Does anyone have any experience using this website? Using my Schwab credit card I can receive an additional 2% back on my purchase, which potentially gives you a few bucks back.
Do additional websites like this one exist out there?

Betcha

I think it's hilarious that two co-workers bet a coke that I'd be engaged over break. I told them the obviously don't know my boyfriend. It's funny because they have asked me about this multiple times and I always tell them that it's really not in the works right now. Will they ever truly listen?
It's a hard life being the young, single girl @ work. And most of my co-workers are 30 and under. :p