Ok, for you Yugo Tok fans, like me. I have 2 options for you for extra mag's
One, convert a CZ-52 mag, see it done here.
http://forums.gunboards.com/showthread.php?163480-Yugo-M57-tokarev-alternate-magazine-option
I have done 3 this way all with good results. The CZ mag is the same size, and can be modified for the 9th round as well, I just didn't save the site that I got that info from. I have 3 Yugo Toks and a brace od CZ-52's & all the mag's interchange with a little work.
OR
NEW, US made ones for $28. I have ordered 5... :-) Got them and they work great.
http://www.ccsporting