Keep browsing around, they are very popular so retailers seem to go in cycles of gluts and shortages.
Many retailers will be stocking up on them to get ready for the upcoming summer season in March/ April.
I can vouch for the metal King Arms (68rd) mags being quite good and well-priced at between $80 and $110 for a box of 5 mags.
They are generally regarded to be a balanced deal and work with pretty much anything as far as I've read.
Always double-check compatibility before you buy, and shop around before you punch in that credit card info.
|