I am looking for a factory error yellow lantern ring. Instead of the sinestro corps insignia iit has the the green lantern corps insignia on it. In other words, If you could find a sinestro corps ring with a green lantern symbol I would like to buy it

Pardon me for asking, but have you actually heard of these appearing?

Yes, I have heard of these appearing. Though not very often.

We don't have any that I am aware of but I don't know what we would even charge for it if we had them. Sorry that I couldn't be more helpful.