Zastava Arms still makes the mag's and the M-57's, both in 9mm & x25mm. Sadly the mag's are not imported BUT they are making new ones for some of the surplus imports, those are the unmarked ones found on the newest imports. If you recall most of them come with 2 mag's. All of the imports had to...
Yugo Tok's M-57's are still made by Zastava Arms as are the magazines.
There are also good ones made state side by CCSA, http://www.ccsportingarms.com/product.sc?productId=58
I have 3 of the M57's and some 15+ mag's...