originally this was £18-£20 IIRC. there is some scenery (watchtower, lift, other stuff), counters, and a book (nice big book with great pics and fluff, plus lots of interesting rules).
i dont know how much it goes for these days, but i know that if i had lost my copy (thankfully i havent!) and wanted to get back in the game, i would easily pay the original price if i had to (without that book you are stuck using the 6 basic gangs, which can get old fast).
in short, you got a real bargain IMO.
have you checked ebay for comparitive item listings?
hope that helps
p.s. have you considered getting hold of the core rulebooks (Rulebook & Sourcebook IIRC), painting up some guardsmen etc as 2 gangs and trying to get people interested? its a very good game.