I picked up 8 30 rounders at a gun show a few week ago for $5.75 a piece. They were all used, but in great shape. One of them was a Chicom no-rib as well.
![](/images/smilies/icon_smile_big.gif)
Other than that, I got all my other mags either off the EE here(they average maybe $8 shipped, unless you can jump on a good deal fast enough), or through mag deals. I got a dozen from Centerfire systems 4 for $20 deal, and Sportsmans Guide still has a deal going as mentioned above, although it is not as spectacular of a deal as they had going before, but it isn't a bad price either.
The mags are out there, new ones aren't as plentiful, but slightly used ones are everywhere, for OK prices.