Your experience with your friend is what made my dad to teach me to ask prices elsewhere before coming to my customer or friend. I have lived by this and more often than not, my customer/friend would try selling higher but then I insist on getting it at the normal price because I know what it is.
Hehe 😃..that's the way to go
Nowadays..I buy things from friends but only products I know the price to avoid issues with our relationship 🤦