It is most likely a scam.
Don't be discouraged by this. All you need is one buyer, not two, just one.
A few years back, everyone were selling Zoomer free Samsung Core LTE of $150 or less. But I sold a new-in-box Core LTE for $195 and an one year old Core LTE for $140.
Public Mobile $37 5GB, $13 250MB, 2x $8 50min/50text, Fido $10 4GB data only plan,
Zoomer $36 loyalty 4GB plan, $0 FPL home phone