I noticed the website GoHasting.com is doing there usually 20% off used game deal, and I noticed that they have Lego:Rock Band in stock. Now I order one, but I don't know if the export code is guaranteed to work. I'll let everyone know once it comes in.
I've ordered a few games from them before it will take about 3-5 days to come in. Hopefully the code works, but if it doesn't no biggie.
Edit: I just noticed they 10% off new games as well. so it's 45$ with 3 dollar shipping.