They are pretty tough to find like other mags. both of those places are sold out. There's a guy selling them for $70 apiece on another site(he has like 15 brand new ones).
I was at gun store in OKC last week(a week ago Friday), and bought 2 when they had 4. Went back to get the other two just this past Thursday and they were gone.
I would get on the notice list from some of the distributors and when the email comes in, don't hesitate to order.
1911 lovin', Glock carrying, and Hk buyin.