Take a look at Facebook Marketplace.
Take a look here
http://www.refurb.me/en-us . Vast array of products, for which you can set search parameters and only see what you're looking for. You can alse set a Notify Me flag to get an email when something you want but isn't currently available, becomes available.
If you want to reply, then
register here. Registration is free and your account is created instantly, so you can post right away.