The well-respected King 2280 4-valve non-compensating euphonium is a staple in the mid-range line. It has a large shank, a great sound, and a kicker/trigger on the 3rd valve slide for intonation assist. This one was a demo at some trade shows and looks to be in perfect condition. Hard case included. Buy-it-now price is $1,925, which is lower than any comparable 2280 I've seen in this condition.
https://www.ebay.com/itm/264265277554