The ★M9 Bayonet | Doppler is a popular selling item. OPSkins currently sell the item for $250 USD whilst the steam market varies between $360 to $400 USD.
That is $110 USD profit before steam tax. However, depending on the phase of the ★M9 Bayonet | Doppler it can also adjust the selling price. Better phase ★M9 Bayonet | Doppler can be sold up to $1900 USD on OPSkins.
If you are lucky on the steam market, you will be able to flip the ★M9 Bayonet | Doppler from steam market to OPSkins.
As you can see some ★M9 Bayonet | Doppler sold at $185 USD whilst the lowest price for selling an M9 Bayonet | Doppler is $250 USD on OPSkins or else yu can resell it back on the steam market to maximize the profit.
OPSkins : https://opskins.com/?loc=home