I bought the same one for the wife. It is really accurate and reliable. I bought extra 10 round mags for it at Walmart. Haven't come across any hi-caps for it maybe because of the keyhole design of the magazine. My bullet supplier is offloading extra mags for this too? He wants $8.00 piece.
Following is pics of the mags for sale.
8 bucks is reasonable price. Will probably pick up a few mags for it when I get into Mesa next May. Got 2 C9's and a Savage 64f I have yet to even hold yet. Almost bought a 9mm Carbine with a scope and 6 mags for $250 but the ad was 5 days old when I got it and the guy said the first call bought it. http://www.oodle.com/
really let me down on that ad. They supposed to get those ads to me quicker than 5 days old. I wrote them a nasty email complaint.