https://backpack.tf/classifieds?item=Front%20Runner&quality=11&tradable=1&craftable=1&australium=-1&killstreak_tier=0

Buy Orders start at 1.84, ~1.85 keys.

Sell Orders start at 3.02, ~3 keys.

Bot.tf Sales:

https://ibb.co/ZVL9RNX

https://ibb.co/SPD1BrP

3 Sold for 2 keys.

1 Sold for 1.85 keys.

Marketplace.tf Sales:

https://ibb.co/HY51Wb9

1 Sold for $5.40/ 1.87 = 2.88, ~2.9 keys.

1 Sold for $4.18/ 1.85 = 2.25 keys.

Excluding all other sales due to them being either too low for current buy orders, or too high for current sell orders. The sale for 2.9 keys is an outlier sale, so I won't be including it either. Going with 1.85 - 2.25 keys.