Nice-looking 2900TA for sale, including hard case. Starting bid is $3,799.99 from a very-highly-rated seller.
Seller's description:
Up for your consideration is a Willson 2900 TA-1 Euphonium with molded case and Willson 51D mouthpiece. If you are reading this, than you already know the quality of this instrument. This horn was professionally owned and is in immaculate condition. We had our tech go over it just to make sure. Check the pictures for condition. I have tried to include views of all sides and closeups. I could not find any dents or dings. Wear is at a minimum as it was not used very much. This horn was owned by a professional musician and was cared for accordingly. This sale is for the lower 48 USA only. Shipping is $80.
http://www.ebay.com/itm/Wilson-2900-...-/351379553993
(Many more photos on the listing linked above.)