When I bought the CZ 75 Compact it had a couple 10 round magazines with it.
I promptly ordered the standard capacity magazines available to those of us not living in politically corrupt/oppressive states. There are multiple sources for these. I got mine from Midway, others here will name their favorite vendor (usually anyway). I even ordered a couple magazines for the full size CZ 75. Yes, they stick out the bottom of the grip. However, if I've gone through the 15 in the gun and still need ammo, I don't care if the spare mags. stick out the bottom of the grip a little bit and I'll be glad to have the additional rounds.