There are "for sale" groups on Facebook where you can post and sell your unwanted yardage. Current fabric goes best at about $7-8 a yard, and older stuff will fly away at $3-4 a yard. I have a sale there every so often, when I'm feeling too guilty about all the fabric I have and will never get to.
You need a Paypal account (or the equivalent), and some flat rate envelopes and boxes to ship in. You can print shipping online from the USPS website, or use PirateShip.com.