From what I've seen, the bonuses stick around right up until the release. One thing you could do to offset the cost a bit is to add to your steam wallet over time, like $5-15 here and there. I'm really bad about doing that with multiple credit cards to build up my wallet.
Either way, you'll be good if you have to wait a couple days before release. The only other thing I can suggest is to check their forums or email them
I have a whole slew on games and looking to sell to them yet all I can find are reviews about purchases. Just from their "sell your games" page and the titles I have on that list alone amount to about $350. I have plenty others that I plan on emailing them about what I could get for them. They're the only site I've come across that pay cash out like that for just loose carts. Every place else, I wouldn't get jack if anything at all because I don't have the boxes and manuals.
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