Inexpensive 9mm
I second a Makarov as well
But if you're wanting a inexpensive 9mm Parabellum, I've seen Tokarevs in 9mm Parabellum. I can't speak for the 9mm versions, as I've not shot one. I can speak for the original 7.62x25s I've not heard anything bad about either one. I've looked on various boards on those who converted their 7.62s to 9mm, most have had no difficulties feeding either round.
A Tokarev can be had for about $150-$200 in either caliber according to Auction Arms and Gunbroker
Also something to consider is the FEG PA-63 in .380 or 9x18mm