I wanna know will Blair and Chuck together at the end of the season 2?

Uhm, I'm not sure what you're asking because your actual question & your comment are 2 different questions...

1. Season 2 isn't over yet, so they don't sell them yet. Normally you can watch them in the video section on fanpop, or you can find them on youknowyouloveme.org
2. Since S2 isn't over, we aren't for sure whether CB will end up together, but with some of the spoilers we've seen, I think they will.

If you want to know the spoilers, let me know, and I'll point you in the right direction.

you can watch it on wwww.tvduck.com
and we don't know about chuck and blair because the seaosn hasn't ended yet, like Shandii already said (:

most likely i mean the do love each other