20$ from the get go
http://www.copesdistributing.com/762x39-30rd-p-8798.html
True, but add in shipping. Copes isn't that bad with it's $9.95 flat rate. More magazines, less per piece cost.
The listing is closed at $330.00. With $30.00 shipping added, whoever got those paid $18 a magazine, shippped. Pretty good. I see that some of his earlier auctions were even a better value.
Apex still has their "excellent" grade magazines for sale, with a discount for more than three.
http://www.apexgunparts.com/vz58-30rd-magazine-aluminum-grey-7-62x39-excellent.html I bought six recently. Four came plastic wrapped, with three of them pristine NOS and one in nice, possibly refurbished, condition. The other two were, by their own grading system listed on their site, somewhere between "good" and "very good". I was satisfied as even the worn ones are in very stout and usable condition. I got them for about $22.50 each shipped.
Buying enough mags, Copes is probably a better deal. I don't think there will be too much functional difference between "good" and "excellent" or NOS mags. I guess the springs could have more use, although I don't know at what point they'd be worn out. Some of the mags I've gotten in the last couple of years look beaten-down, ugly, and disenfranchised, but work just as well as the pretty ones.