Up for sale is one used Boss ME-80 unit.  It is in very nice condition and is fully functional.  I will include a non-Boss power source that meets the Boss technical specifications.  You may consider a Boss PSA to be conservative, however this product is well out of warranty so use of a non-Boss approved power source means little.  These were produced between 2014 and 2023.

Here is a description from another source:
Sporting eight effects categories, four footswitches for tandem use, built-in wah/volume, COSM amp modeling and Boss Multi-Dimensional Processing (MDP) technology for an almost infinite spread of effects, the Boss ME-80 Guitar Multi-Effects Unit is an all-you-would-ever-need Swiss army knife of pedals. Compact and easy to carry, the ME-80 also features a USB port for adding even more sounds, making it the perfect solution for those tired of the hassle with boards.

Please review the photos and ask any questions you may have.  Item is in full operational condition, but I cannot warrant its long-term use.  Returns are not accepted.  I will insure the package for full value of sale.  Mainland US bidders only please.