I found two for mine at a small gun show last Sunday. They are not as nice as the one that came with the gun but they look like they'll work. They were a steal as the show had been lightly attended and the seller was willing to deal. A Benjamin got me the mags and a Brownell's sight pusher in an unopened box.

At the rates I've seen, $50 is not unusual for mags these days. Look at what new SIG, H&K, Beretta, etc are going for. Decent Glock and 1911 mags are in the upper $20 range and they are common. I guess it could be sticker shock but I've been shopping for Winchester 1905/1907/1910 mags and that is sticker shock. Even repros are going $50+ dollars if one is lucky with originals well over $100.