Moto - gotta wish you lots of luck my friend - for the simple reason that everyone who's got one ain't selling and everyone else who hasn't wants to buy one too...
You could try a close second and do what I did recently - buy a Blizzard 1240 and then set about getting it upgraded to a 1260. Failing that try and get an Apollo 1260 - admittedly not so nice an accelerator (in my opinion) but nevertheless will do the job and speed up your A1200 nicely.
Well, I guess I still need a bit more luck. I'm still looking for one and willing to pay for it!
-daniel