I couldn't get any from Freedom Ventures last month at the time I needed them, so I brought some in from Angus at Ghost Holster.
These are the best mags I have seen, by far, but not the cheapest (but I haven't seen any Tanfoglios).
You do have to mod Angus' to limit the capacity to 10. I am not that handy, so the first one I did was a pain, the other three were a cinch. They have been durable and flawless in my use (IPSC).
I have some ProMags on the way. They are not the cheapest either, and apparently quality is hit or miss. I will post on those later.