BRAND NEW FENDER MUSTANG GTX-100 AMP - $400 (Joplin)

I have a Fender Mustang GTX-100 that is new in an unopened box.
Just paid $500 (before taxes) for it.
I want to trade it for a Fender Mustang IV or V (in good shape).
I'm not going to list all of the tons of features this amp has but it's the best out there.
Look it up online.
Might consider a small Fender tube amp, like a Champ X2 or etc.
But mainly looking for the Mustang IV or V.