Major Drills wanted me to restock something from the Toy Shop. While he only gave me plugs, I did get this:

Achievement Earned! High Rarity Grabber! Buy a rarity 99 item from a normal shop!

Rainbow Vortex Blob Doll Purchased

I accept 790 and Rainbow Vortex Blob Doll been put in your items.

I'm so happy! I didn't think I'd get lucky enough or be fast enough to restock a rarity 99.

Congrats! C:

Thank you :)