I've been a firearms instructor for over 40 years. 20 years at The Federal Law Enforcement Training Center. I'm a NRA Counselor, Instructor and have 5 more NRA Ratings. I've been with the Straight Shooter since the club was formed. If you contact the Straight Shooters, they will sent you to me.
Shooters World will low ball you, I worked there for almost a year. I would think they would offer $300 - 350.00. ( If you're willing to go down to 300.00, send me a PM, I'll buy it today.

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Nordic Pawn closed 4 or 5 months ago.
Pat's Pawn in Leesburg is out of business
You must be a member of the Straight Shooters to post on their web page.
There are web sites you can list on. Some are free, but most charge you a monthly fee. If you go this way be careful about who you invite to your house.
$400 - 450.00 is a fair price for a used Glock. Once you walk out the door with it, it's a used gun.
I think I have addressed all the threads. I have sold gun collections for people in the Villages for years. Mostly after a husband has passed. If you send me a pm. I'll give you my phone number and we can talk about the best way for you to proceed. If you go to the club web page to the Ask the Gun Guru, you can get me that way.