are advertised on ebay, and there's a healthy market for good names. The prices paid tend to be a lot less than in the heady days when dotcom names were being traded for millions of dollars, but if you have a desirable name you can still get a reasonable price.
The problem is a bit like finding a partner - you need to find the right person for your name, and they need to find you. The only way this is going to happen is if you advertise, and that's where it can get difficult.
You have to start somewhere, so I suggest you
Don't get too excited - many names never sell, and it can take months.