Antiquark 6-pack
The Particle Zoo
$62.99
An anti 6-pack containing only the antiquarks: Antiup quark, Antidown quark, Antistrange quark, Anticharm quark, Antibottom quark, and Antitop quark.
For ages 5 and up as it contains glued-on/small parts.
The Antiquark 6-pack is available in a lightweight shipping saver version which is especially nice if you live outside the U.S. All 6 plushes will be filled with lightweight stuffing. Of course you won't get the full effect of their varying weightiness, but they will be the same in every other way.