where did you sell them for $90 ?

They're what's called OEM. They come off of the same line and are made to be sold in markets outside of the US. Sometimes there are minor changes that make the differ slightly from the retail models. For instance, I bought some Speck iPhone cases. Identical from package to case except for a difference to the button holes.

I have to put in this week's order today. When the next batch arrives, if you still want a pair to check out...I will sell you a pair cheap. No problem.

I'd guess he has a friend or knows someone with a storefront who will have no problem selling them.