Picked it up yesterday, my second CZ 75B .40, along with two Essential Arms AR lowers. Ordered them from my buddy who is an FFL holder and has a small shop. He has TONS of AR mags if any one is looking. Pmag 20's and 30's, Brownells 30's and H&K 30's. PM me if you want his info.
For anyone else with a .40 cal CZ75, If you're looking for more mags, order the ones for a "Champion" model. They are made by MEC-GAR (they supply the factory mags for CZ). They hold 12 rounds instead of 10. Flat metal base plate rather than the thick plastic one on the 10 rounders. Brownells has them in stock.