Where do you sell a stained glass window from a home?

There are several ways of going about it. One would be to contact the stained glass company that provided them. They may know a church looking to install them and trying to find a good deal.

Advertising in church publications is one of the best ways to do it, to find churches that are looking to find them.

You could also sell them through an online auction house. You might do well there one at a time.