If you can wait until the next 1500, you can usually get USGI Checkmate mags for around $12, New in wrapper.
I went out there yesterday and grabbed one magazine. They are the factory mags from Italy. I also found a place to get mags for my Hi-Point carbine. They didn't have very much in the line of ammunition but they did have one brand of 9mm JHP.Bradis Guns in Camby (far SW side of Indy) has factory mags for $19.95.