How do i find the value of my hockey cards?

I have alot of hockey cards (around 600-800) Most of them are old (1980-1999) and then I have some newer upper decks and O-pee-cheesand stuff. Like a few 06-07 Crosbys and Ovechkins and stuff. But anyway, I was wondering if anyone knows a website where i can find their value and everything. I fyou could, that would really help! thx