Well, if you can find them at $145, buy as many as you can. That was a good deal, glockhead! They normally sell for upwards of $200, sometimes as high as $250. But one can get lucky. I found one for $125, just before the vendor at that gunshow was about to double the price based on others he saw while perusing the tables. He said, "get it now before I mark it up, I'm way underpriced". That was three years ago. Even the 30 cal ones often go for $200.
So, depending on condition, you can probably ask somewhere around that $200 mark and have no trouble finding a buyer.