We have a gun shop here that will take a gun in on consignment, let you set the price you want, then they add 10%. They do all the sales work, the buyer will have to do paperwork and the NICS check. Then you come pick up your money. And, if you're like me, promptly spend it all there in that shop.
It's alot better then dealing with strangers on Armslist or walking the aisles at a gun show.
Glocks tend to be easy to sell, I hope you can find what you really like.