Good luck with that, it's the same price I offered him for all 20.

Odds are he's either
A) small dealer that buys in small quantities and needs to hit $380ea to make it worth the effort. Which there is nothing wrong with, used to be involved with a small chain of Zenith stores in CA myself.
or
B) trying to find a sucker here to get more than he can on ebay

The problem with either is there are better deals to be had. Just earlier today Amazon had this same card up for $360ea shipped, granted it sold out quickly.