I've looked everywhere. There are a few in the trades, but no prices. There are none in the shops, or in the auctions.

Does anyone have any idea how much they're worth? Thank you!

since the achievement for those came out they have disappeared from user shops. You can see the average price on them was 250k-ish. You might be able to get a good bit more for it now though. Perhaps as much as 5 million.

Ohhhh c: Okay, I'll see what to do! Thanks! c:

You are welcome. Good lluck selling!