I know of a couple of LFS in the area I'm originally from that would do something like 1/3 or 1/2 of the adult selling price, which, for a $10-12 fish isn't so bad...a molly or guppy, however, might not be worth it if it weren't for the shear number of fry you'll be getting. But again, stores are going to be different when it comes to those types of things. Keep in mind that even with shipping costs not included for the store usually they would be getting HUGE orders of fish all at the same time, so shipping isn't such a big percentage of the cost compared to a hobbyist ordering a few fish online.