I'm not sure for around $300, but if you save a little more and are willing to invest a bit more, you can get into a very nice camera in the $500 range. My Minolta was $585 and is basically an intro level professional camera.
To work with your current camera, I'm not sure about the exact model you have, but if it's got ISO control, odds are it's got shutter speed control as well. I'd say set the ISO lower, set the shutter speed higher (which will make your photos rather dark), then increase the brightness in photoshop or something similar. Also don't be afraid to take many, many, many shots and have only a few come out.