If you search the classifieds on the Amiga websites, AmiBay, and eBay for A1200 or Amiga 1200, you should find plenty! You should decide what you'd like to use your 1200 for at this stage though, if it's just for old games that run fine on the standard chipset, you don't need more than an 030 board. Arguably the best 030 board was the Blizzard 1230, this one seems a good example but I think it's already sold:
http://www.amibay.com/viewtopic.php?f=24&t=1814Asking price was UK£130.
An 040 or 060 will be much faster, but will break some very old games (though WHDLoad will help here). You should go for them though if you're planning on doing anything serious, like web browsing, photo editing, playing MP3s etc.
