Buy it, you won't regret it. The price isn't bad either if its in very good condition.
I bought a CZ75B .40 from a pawn shop in like new condition a few years ago and paid just under $400 with one magazine and no box. One thing I did have to do to it though is replace the weak extractor spring. After that it worked flawlessly with any ammo I tried in it.
If you do buy it, get a .22 Kadet conversion kit for it. CZ makes an excellent conversion kit although it is rather expensive. However, it can be found on sale occasionally.