I've mostly bought the MecGars (that are the actual 16rd CZ factory mags) commonly for $16-20, along with a couple of the slighly higher capacity anti-friction versions for around $25. I know ManVentureOutpost had them in stock at that price less than a week ago. No telling if that's still the case, however.
SI VIS PACEM, PARA BELLUM
People often ask me, "How many ARs do you have?". Well, that seems to be in a constant state of flux. An honest and concise answer might be something like "six and five-eighths". And to the AR enthusiasts among us, that will make perfect sense.