you can find it now for like $25 and you get CZ which has both mp and sp modes and the sp only CZ
S. CSBot is essentially the sp side of czero, tour of duty. I thought my $30 through steam presale was well worth the $$$. I've been playin this like crack, and by the way, I started playing back in the 1.5 days when everything worked perfectly... got my CS from target for like $20-$25, which also got me the whole half-life series available through steam (CS1.6). I feel $50 is worth the 8 or more mods that I actually play on this engine. Kept me entertained countless hours for about 3 years straight now... I got alot for my money!