Just wanted to give a thumbs up to Mag Commander (http://www.magcommander.com), from whom I just bought a new magazine for my S&W M&P compact.  Very professional and courteous, order was shipped immediately, and the price was VERY low compared with the other sources I checked (approx. 30% less).   I assumed there might be something strange when I got it, like it would not be OEM or something.  But I got a stock S&W magazine identical to what came with the gun, along with a nice hand-written note thanking me.  And the website is nicely done.  (I'm not claiming every product they have is discounted like this, but mine was.)

It sounds like the guy has a small business and trying to give it a go.   You might try them if you need a magazine or two.

i will second that.  order came in quick and they had good pricing!

will try them again.