I've got genuine MiST in mint condition, it was used up to 8-10 times. It's Version 1.3 without MIDI ports, but you can use USB-MIDI functionality from ATARI ST(E) core and works perfectly.
New like arrived yesterday from DragonBox shop, produced by "Lotharek" from Poland. Does not include the PSU or SD card, you will need to provide this stuff as usual by yourself.
Current price: $140 (starting price was $200), will be shipped anywhere in the world and packed carefully with surrounding anti-shock bars. Make me a fair offer.