Our local tack shop has a new combo leather/suede/synthetic saddle for $315. It's light weight and comfy. I'm not terribly impressed with the staining on the used synthetic saddles I've seen so am hesitant to purchase a synthetic saddle.
I've seen some used saddles on Craig's List and ebay. I've seen some pictures of saddles that look nice. The brands were Red Rider, Saddle Inc., and Hereford. There are some older saddles (ebay) too but I'm a bit concerned because I'm worried about dry rot. I've found a couple of no name saddles also. One was a heavily tooled Mexican saddle. The no name ones were 15" though.
The important things for us are comfort and weight. We'd like to get the best quality of saddle for the best price. OK, I realize that in the under $300 range we're not talking about a good quality saddle.