Where in the world can I buy used GL.iNet devices?

I agree with you, it would be great if users would inform the community where to buy a used device. Models differ from each other in technical characteristics, even after they stopped being produced. There are models that have stopped being produced and they are better than new ones.
New does not mean better! 100%!
I don't know what needs to be done, for example, with MUDI GL-E750 How to change the battery? - #11 by bob2022 so that it stops working on its own, you can replace the battery and it will work for at least 5 years more...