Why are mags so expensive? It doesn't make that much sense to me. Does anyone have a site where I can find mags for cheap and they have a good selection. Brownells, numrich, and midwayusa do not have one of the mags I am looking for. Does anyone know what mags would fit BRNO mod1? Also, Interarms jw 15 only has a 5 round mag on numrich. Anyone know what would fit that?Thanks in advance.