I bought most of my sweaters from ebay, and had great results. Like new condition, and maybe 1/3 the price. Some of the hand knit makers are REALLY expensive, $300-400 new, but you can find them used for $50-70. Quite a bargain.
Of course, I now own four plastic tubs full of sweaters, so maybe avoiding ebay is advisable if you lack impulse control. Browsing ebay I always find something unique that I just can't pass up because I don't know if I'll ever see the like of it again, AND it's at an attractive price that I just can't say no to...
I need an intervention. And some decent cold weather so I can wear these things out.
A lot that advertise hand knit are actually hand loomed. Die Workwear did a long article on the differences.