One was priced at 100m a week after it got added to the game, and then it got traded for some undisclosed sum.

It's up to you if you want to wait for a better offer, or just sell it as is. The rate being given out looks like it's not an easy achievement to get.

Plushie market is weird.

Even junk rare weapons sell for 350mil+ pretty easy.

Plushie/beanbag collectors seem to think that rarity doesn't matter to them and seem almost never willing to pay a premium for something truely rare.

For the number that are availible/will be availible over the next year, It seems like it should be 350mil+, but good luck ever getting a top collector to pay that.

If it was me, I would hold out for a lot more than your probably getting offers for. But if you need the sP, maybe aim for 150mil.