Any 7.62X25 thats listed as surplus will be corrosive primed so you'll need to spray down the bore and the guts of the gun with Windex. Once home tear it down, spray some more, clean with warm soapy water, dry and then oil.
Try to get Fiochii or Privi-Partisain ammo. Neither of these are corrosive primed.
Copy that. It looks like ammoman has it for $149 w/free shipping. Sportsman's Guide is $116 + shipping. I didn't get to the shipping cost.
I did find some bad reviews of the Polish (cracked cases). J&G even has a disclaimer on theirs for that reason. Their Yugo is $7.70 for a 70rd box.