Re: SAXQUEST IS FOR SAXOPHONE TALK ONLY
Keep saving, as you will need at least $8,000 and up for a Bass sax, vintage (plus any repairs, repad work, adjustment etc.). New, the cheapest Asian made one currently available from International Woodwinds is $9,499.00, and a new Selmer or Keilwerth goes very near the $20,000 price range.
Not a cheap proposition.
Regarding the Conn C-Melody New Wonder model;
A proper and accurate valuation can't be made without, a the very least, proper photos to illustrate it's condition, finish etc. C-Melodies don't fetch high prices in general however. A safe middle ground would be in the $250 to $500 ball park for a very fine, original condition example.