I got one from Big Dogs in King George, VA. Haven't been able to test it out yet since im still waiting on my gun, but hopefully in two weeks I will be able to. I think they were only $20. Pro-Mag.
I shot IPSC for a several years and only used Wilson magazines. Do yourself a favor and buy Wilson mags from 2A. It's not Wilson marketing hype, they are great mags and stand up to a beating.