Anybody Know a Good Source for .30 Carbine Mags?

The only one I've found for good-condition GI-issue is J&G Sales out of Phoenix, but $24.95 a pop is pretty pricey. From what I've seen, "some surface rust" at some other sites might well mean "looks like a lace curtain." As I mentioned before, I fully intend to get a CMP M1 Carbine when they start selling them in March, and I'd like to have ten or twelve magazines to go along with it. According to reports, the CMP has rifles, but no magazines to speak of.