What did I scam you out of/off of/from/for?

'Out of’ sounds natural, but if you’re asking the reason for the scam, then ‘for’ is suitable.

In that sentence, out of. What did I scam you out of? But also: What did I scam from you? How much did he scam you for?

“Off of” can always be shortened to “off”, that being said it’s incorrect in this instance. Anyways, that’s just a footnote, other commenters provided the correct answer