Sales

Sale 1: Sold for 120 keys

https://backpack.tf/profiles/76561198232041512#!/compare/1599436800/1599523200

https://backpack.tf/profiles/76561198083739523#!/compare/1598486400/1599523200

Sale 2: Bulk

https://backpack.tf/profiles/76561198011239925#!/compare/1598313600/1598918400

https://backpack.tf/profiles/76561198232041512#!/compare/1598832000/1598918400

Sale 3: Untraceable

https://backpack.tf/profiles/76561198105071091#!/compare/1602201600/1602288000

https://backpack.tf/profiles/76561197996311747#!/compare/1602288000/1602460800

Sale 4: Untraceable

https://backpack.tf/profiles/76561198055672922#!/compare/1599609600/1599782400

https://backpack.tf/profiles/76561198105071091#!/compare/1599523200/1599609600

Sale 5: Sold with Scorching Flames Deep Cover Operator + about 15 keys~ in sweets for Searing Plasma Bonk Boy

https://backpack.tf/profiles/76561197996311747#!/compare/1603152000/1603411200

https://backpack.tf/profiles/76561198086247757#!/compare/1603238400/1603411200

Using on the Searing BB, as it has no other recent sales.

Marketplace sales

https://marketplace.tf/items/tf2/451;5;u57

Nothing recent.

https://marketplace.tf/items/tf2/451;5;u57;strange

September

189.99 on September 12 (189.99/1.88 = 101.06 rounding to 100~)

https://manic.tf/keyprice/?at=2020-09-12

Listings during the time: https://bot.tf/stats/listings/YD1G18RL

250 on September 30 (250/1.83 = 136.61 rounding to 135~)

https://manic.tf/keyprice/?at=2020-09-30

Listings during the time: https://bot.tf/stats/listings/4O6OQ8LP

Current Classifieds

https://backpack.tf/classifieds?item=Bonk%20Boy&quality=5&tradable=1&craftable=1&australium=-1&particle=57&killstreak_tier=0

https://gyazo.com/f217c717fd473f2ab8d4c7d368f79f57

Summary

Sales at 120.

Marketplace sales at 100 and 135.

Conclusion

Going with 100-135 here.

Take it easy.