ok well i may have spoken a bit soon, especially considering your $300 budget. however if you scrounge around, there are deals to be had. 155 bataleon airobic 2011 - $310 on amazon. other good places to look are at the outlet on evo.com or the-house.
to get a premium board that has a sidecut like vario grip (never summer) or magnetraction (lib tech and gnu) you will have to spend more like $400-450 for last years models if u want something new (just from a preliminary search around the net).
the evo outlet has alot of really cheap boards and there are several internet sources for boards in this price range. just remember that the selection is bottom of the barrel, you get what you pay for and there ARE diamonds in the rough but its gotta just be the perfect item at the right time.