Looks like Jegs has some left:

http://www.jegs.com/p/Barry-Grant/Demon ... 9/10002/-1

I have a 32 Bantam Altered with a 406 SBC, 8-71 blower, Enderle Bird Injector, 10.5:1 static. Right now I am running about 16 # boost and the distributor is locked at 30 degrees. I do not run a retard. So far, running alcohol, I haven't experienced any detonation damage. I do keep it happy by runnin...

Buying new pistons always works. The problem is that now you have shiny pistons and a rusty wallet from lack of money in it!

Yeah, you really have to be careful about putting scratches in the piston. Can make spots for carbon to collect.

Seafoam works well also. I put a can of it in a clean tupperware bowl and let a piston soak for a while. Then you can use a brush to clean it off.