Centerfiresystems has them for $50 per 4 pack. They come with an E German pouch, and besides a coating in cosmo look pretty darn good. I just got three fourpacks in the mail last night, and none of them seem to have any rust, just some slightly surface wear here and there. I would describe them as used/very good to excellent depending on the mag.
At $12.50 a mag that isn't too bad a deal. Of course with Centerfire offering 4 packs of combloc mags at $20 you can get mags cheaper, but if you want the BHO feature that is about the only way to go!
About two months ago clearview investments had 4 packs for $32.99, but I just missed out on that...doh! Worst part is it is the excat same mags, i.e. Clearview and Centerfire are in the same building, just have different books. I know this for a fact as I ordered from Clearview, and when I ordered from Centerfire two weeks later the lady on the phone said "I see you have been a previous customer.