The problem with buying work from hot up and coming artists in the current market is access, not price. If a gallery handles an artist's market correctly, they'll generally keep prices down, while selling to established collectors and museums.
I've been trying for 2 years (unsuccessfully) to get a piece from a certain artist. During that timeframe, said artist has moved from semi-under the radar to one of the hottest in NY. Meanwhile, quality large paintings have only increased from $40K to $60K. If a good example showed up at auction, it would likely sell for a quarter million. Everyone knows this, but there's just no supply unless you're connected or very good at playing the art buying game.