shipping rulers can be expensive, anything bigger or longer than 8-10" can get snapped very easily in the mail process.
I belong to a facebook group called NWQuilters or maybe it is Pacific NW quilters, anyway we have a sister selling page so I know when I list something there I can meet in person for the switchover. I've sold four of my sewing machines and some misc stuff too unruly to ship, including about 30 rulers. I had to let them go because they were no longer working with my eye disease and shifting them on to another quilter home made me happy. I think I listed them about 75 bucks, the buyer was happy so win win.
If you do FB see if there is a (active) group for your state. I know tere are general quilter selling groups but I have found with those the listing sinks to the bottom rapidly so doesn't get many eyeballs at all.