Hungarian Tanker mags are sought after these days and from what I've read, more pricey than your average 30 rounder. Power Surge has had good things to say about the Korean 20 rounders. ( After checking them out I'd agree, The Korean mags are definitly getting better than when they 1st starting showing up).
This might not help much but...I rarely buy online and enjoy the hunt "in the wild" for most parts and try and get in good with all my LGS's. I noticed my LGS had a Mak-90 and a Wasr 10, both with some nice Hungarian 20's. I brought in some run of the mill 30's I had under $10 in and We both decided ppl would be more likely to want a 30 with their rifle instead of a 20.
We straight traded my 30's for the Hungarian 20's and after seeing what they wetre going for... I came out ahead.
I've done this with a few different parts at a few different places, Never hurts to ask. Like I said , not very helpful but another place to look.