I recently went on ban-hammer and killzonegaming to check it out. they had custom knife models in the store. i think it is a good addition to the VIP store since not much things has been added for a long time.
knives that they have
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Tri-Dagger Black
katana
Axe Rose
Claw
Kung Fu
Screwdrive
Scythe
Lightsaber (Red)
Lightsaber (Green)
Baseball Bat
Reaper Dagger
Kar-Bar
CS 1.6 Knife
RWBY Crescent Rose
Minecraft Pickaxe