If you have a feedstore/western wear store that sells tack, you may be able to put the saddle up on consignment. The fee is usually (from my experience anyway) based on what your asking for the saddle, under $300 you may only pay 5% as an example. The only saddle I have ever sold on ebay was a Wintec english saddle, because in the area I lived in You couldn't give away even a NICE english saddle.
These cheaply made saddles are NOTORIOUS for fitting poorly because they are made by companies (in china/india/mexico) that have no clue/care about the back/build of an american horse. Hell I have even heard of some of these places that used CARDBOARD for the inner riggings of the saddle... I say cut your losses, and look around for a nice used name brander. Not going to be the cheapest route, but It'll last you years, and if you have to sell it on down the road, youll get far closer to what you paid for it, than with this saddle you have now.