Bots are buying at 16, I'm just setting the high value to 1.5x 16, since with most low tier hats that's what I've seen the hat at.

Bots buying at 16.

https://marketplace.tf/items/tf2/935;5;u61 Marketplace selling for 34.99$ With keys being 1.87 on mptf, this would make the price 18 keys.

https://backpack.tf/stats/Unusual/Voodoo%20JuJu%20(Slight%20Return)/Tradable/Craftable/62

A similar effect being sold for 21 with bots buying at 18.77.

https://mannco.store/item/440-disco-beat-down-unusual-voodoo-juju-slight-return

Dbd one being sold for 50$ on Mannco, totaling to 26.3 (29.2 *0.9 to account for 10% tax) in keys, since keys are 1.71.