The answer depends on the power of ten in question.
00038 kilograms = 38000000000 micrograms
0.00
There are dozens of determining factors on price. Obviously condition, which also includes originality of all parts inc mag and IF you can find a buyer interested in that particular gun.
It depends on what exactly the conditions are. If you mean from a 52 card deck, drawing one card right after the other, then the chance that they will be those two cards in that exact order is 1/52 * 1/51. This is pretty much a percent of a percent. .00038, or about 4 percent of a percent.