Washington DC vicinity
They do have some used horns....give them a call at 301-946-8808 to check for availability. Ask to speak to Roger Keiper or Byron Tomey. Their new horn prices are equivalent or better than the Brasswind.
http://www.chucklevins.com
They usually always have a full stock of the Yamaha products, and I know they carry Willson euphoniums.
- Scott
Euphoniums: Dillon 967, Monzani MZEP-1150S, Dillon 1067 (kid’s horn)
Bass Trombones: Greenhoe GB5-3G, Getzen 1052FDR, JP232
King Jiggs P-bone