In Europe, they're currently even available for under a euro (or under two euros for a 'regular' expiry date and RSV as well) if you buy them online instead of at retail. For example [1] or [2] (I have no affiliation with the shop).

[1] https://altruan.de/products/safecare-covid19-influenza-a-b-a...

[2] https://altruan.de/products/fluorecare-kombischnelltest-rsv-...