All of the options that I know of have been listed, except the #2 on my list which I highly recommend. Best "value" out there right now in 7.62x39 rifles.
Here is a list, starting with the cheapest first.
1. SKS- beat up Chinese ones have been around $280 lately; others can be as much as $400-500. Heavy rifle for what it is.
2. vz58 (or vz200- these are sort of a AK/SKS hybrid, but they are really nice and machined receivers (not stamped like an AK) and they are probably the lightest rifle on the list. Palmetto has them for $399.99 + shipping and they come with a sling, bayonet, 5 mags...other places have had the same package for $499.99. I have a couple of these and I'd recommend them.
3. AK47- cheap as $449, but prices are going up since Obama's Russian ban. US built guns are up around $1,000
4. Ruger Mini-30- probably in the $700-800 range...honestly I don't have any experience with these guns and I'm not that sure if my price is right.
5. AR 15 in 7.62x39...might be able to build one out of a PSA lower and a complete upper for $600-700. Not exactly sure on the prices there either.
I did see cases of 1,000 rounds for $199.99 + shipping this week. I was tempted.