Team Fortress 2
Counter-Strike: Global Offensive
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Sale on marketplace.tf @4.30$: https://i.imgur.com/Xn3vs3u.png - https://backpack.tf/profiles/76561198107622215#!/compare/1553472000/1553558400
Keys are currently selling @1.77 on marketplace.tf: https://marketplace.tf/items/5021;6/Mann%20Co.%20Supply%20Crate%20Key
4.30$/1.77$ = ~2.45
Here's how it appears on Marketplace, when I follow the link from the Classifieds seller:
Generic craftable key. Between that and the random Marketplace tendency for items to sometimes go for more than their common price point (which is low for uncraftable keys that get lumped in with this one), I'd be pretty surprised if this was enough evidence for a new price.
marketplace.tf has different pages for different uncraftable keys: https://marketplace.tf/all?sterm=Mann%20Co.%20Supply%20Crate%20Key
It just doesn't display what the keys used to be.
This is a pretty rare collectors item, one sale is enoug to justify a price raise, however, due to the seller @3.95 on marketplace a range will be necessary.