Sounds like you don't want to sell direct but dealer?
Why go middle man, they will have to take commission.
selling..... VAF Classifieds, eBay... Trade A Plane, Barn Stormers
buying.....VAF Classifieds, eBay... Trade A Plane, Barn Stormers
LOCAL Avionics shop may take gear on "consignment". They may want a big cut, depending on what it is and price it may sit forever.
Sell it yourself on VAF Classified. Figure out a reasonable price, take pictures and upload them. Then figure out how to get paid by buyer, and then ship it. Pack it well, insure it.
Can I ask what you are selling and what you want for the item or items? Some things sell them self and for a good price. Other things are a hard sell or can't give it away.