How do you sell anything? my dad thinks everything is a rip off and a scam?

How do you sell PCs in Hawaii!! THERE IS NO STORE for that stuff! My dad thinks everything is a scam! So that’s why i can’t sell or buy anything!! HE THINKS EVERYONE IS GONNA RIP HIM OFF! I can’t even sell my PC or anything!!
How do you sell anything? my dad thinks everything is a rip off and a scam?
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