Final copy for this suggestion....it has to be lol. Sorry for the spam on this, but another trade just popped up in the item's stats.

Death by Disco Death Racer's Helmet in-date sales:

Mar. 12th, 55 keys pure - https://backpack.tf/profiles/76561198005429901#!/compare/1583971200/1587859200

Item History: https://backpack.tf/item/4970942652

Purchased by me on Apr. 22nd for 119.95 USD (119.95/1.75=68.54) 69 keys

Marketplace Sale on Apr. 22nd - https://marketplace.tf/items/tf2/30686;5;u100

Avg. price of keys - https://marketplace.tf/items/tf2/5021;6

Item History: https://backpack.tf/item/8645510830

55-69 keys

Previous suggestion: https://backpack.tf/suggestion/5ea5f330d1dbb6461c206d00