When do Steam pre-purchase offer end?

I want to pre-purchase Dark Souls II to get the pre-purchase bonuses (in game items). But the game doesn't come out until April 25th, and I am not flush with cash right now, so I would like to wait a while before handing over my money. But I don't see anywhere when the pre-purchase will stop being available. Does anyone know anything about when special offers usually end on steam?

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

Thanks for the reply. I also just found this $10 off from GMG.

http://www.greenmangaming.com/s/ca/en/pc/games/action/dark-souls-ii-na/

GMG is usually the best place to prepurchase games these days.