Yeah, rule of thumb is trade nothing in there. However, that trade 3 get one free deal that's ALWAYS running and they don't advertise is awesome. Trade any 3 games worth $8 or more in credit in and get a brand new preorder up to $70 fully paid for, no tax? Always a steal if you can get decent trade stuff cheap enough.
Yes, please tell me more about this.
Like free stuff? I have earned hundreds of dollars in free Amazon gift cards through Swagbucks. Check it out here! Earn 3000 points and I will give you FREE shipping the next time you buy from me! http://www.swagbucks.com/refer/Porksta