dj454 :welcome to 10mmTalk!
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GunBroker but they were really expensive
Yes the magazines are demanding a premium price, its a damn shame that some are blaten rip off priced. My advise to you would be to get on MidwayUSA's backorder list and wait. Be sure to get extra springs, bottoms and followers to have on hand. I am using the Wolff 22 lb recoil spring with my S&W1006, this has kept the brass from flying 25+ feet away. Just be aware the extra power spring does add more difficulty to rack the slide.
Good luck!