$75pp is about what I would expect to pay from most vendors. $50pp is what I would expect on a live sale or from another hobbyist friend and what I have paid personally. With the increased quantity of an item bought, price tends to trend lower. Perhaps meet somewhere in the middle in the $225 - $240 range, but also throw in another frag of something to ease the pain lol
With regards to selling at a price in the $200's, I think that's a very unfair price from that vendor. As a hobbyist, I think it's fair to sell @ the price I paid or less depending on my relationship with that person.