sometimes you miss buyers because you under price your item and potential buyers think it is (cheaply made)
there is a site on line called
quilts for sale
they are very reasonable with their commission fees and seem to sell lots of quilts, check them out as a possible market.
also,,now i cant remember which major shop it is (maybe keepsake quilting)n that is offering a selling your quilt feature.
post pictures everywhere you can, exposure will get you noticed and the person just right for the quilt will see it, love it, and pay good money for it as long as it is well made.
good luck
i wouldn't even talk to someone about a king size quilt starting at less than $500 and that is bare minimum because it was made with discount fabrics an easy pattern and i like the person getting it .(normal going price for me to make a king is $1200+.