I really think it is about supply and demand, AND the proclivities of the manufacture. I'd bet half a paycheck that all CZ mags are made by mecgar. It is up to the gun company whether they allow sales outside of the Trademark. Just like the S&W M&P. the mags are clearly mecgar who could sell them for $20-25 on the mecgar label, but for whatever reason, smith doesn't allow it. Right now, CZ allows mecgar to sell various other models of magazines for CZs directly, but not yet the P07. Maybe if they reach a certain production level, they will.