That last post is actually a pretty good deal. As far as going to the gun show, I would avoid it like Swine Flu. Gun Shows, especially lately, are merely a place where vendors go to gouge the living shit out of unsuspecting customers that don't know what prices really go for and just ASSUME they're getting the best deals. The reality is your friend needs to find an FFL who will do a transfer for him. Most all of them will. If they won't then they're giving you a bullshit reason, which really translates to "I wanna sell you MY overpriced stuff." In that case, I wouldn't do business with them anyway.
Fine one online and have it shipped. WASR's and other various Romanians will be some of the cheapest right now. No reason you can't find one in the price range he's looking at. Although I think he'll be paying the upper part of that price range right now. A $300 AK is a bit of a pipe dream right now unless you get lucky and find some desperate sucker. Another option is a MAK-90. Some of the better quality AK's on the market but are easy to find on Gunbroker and other places right now for around $400-450 because they don't have as much of the "fun stuff" like bayonet lugs and slant muzzle-brakes. Also, they usually come with the thumbhole sporter which is easy to replace with an American made parts set and US made fire control group. You can still get it all for around $500.
Something tells me you and your friend will end up at the Gun Show anyway. Let him look all he wants but make him resist the urge to buy right then and there. Friends don't let friends buy overpriced shit!