Middle of last year, I bought a mag for the Sigma "F" model from them. It held one more round than the "VE" mag but I had to sand the thick base plate down about .030", so that it would lock securely into the grip. I think that I only paid $24.00 at that time. Some VE owners have not had any fit problems with the "F" mag and didn't have to shave them, or so I've read.
I got on Natchez website and put 2 Sigma 9mm mags in my cart. When I went to checkout, it would not allow me to enter TN. I found out they will not ship anything to TN, AL or GA. They were on sale for $29.99, if anyone is interested.