There are lots of different types of tube screamer old and new, I got one of the new ones for about $100.00 or so. You could check out Harmony Central or one of the online stores (like musicians friend.com) if you want to see what the current prices are
I paid $100 for mine ( I have the reissue ) 3 yaars ago from Musicians Friend.
"Let that boy Boogie Woogie. Cause' it in em' and it got to come out." -John Lee Hooker- There's no substitute for expeience. So get out there and break some strings on stage.