#1
I'm gonna put a fretless neck on my jazz bass. Where the best place to look ebay isn't turning up much nether is talkbass
#2
Warmoth will build one to your specs, but it will be on the pricey side. It will be worth it, though.
"Maybe this world is another planet's hell?" - Aldous Huxley
#3
Look into Allparts or Mighty Mite.
Composite Aficionado


Spector and Markbass
#4
Try putting up a "WTB" (Wanted to buy) thread in the TalkBass classifieds. A lot of those guys will have that kind of thing lying around and don't think to sell.
I'm not sure if you have to be a supporting member to use the TB classifieds though, and IIRC the donation is pretty steep.
Basses:
Fender Precision Bass
Fender Jazz Bass
1967 Fender Coronado Bass II
Warwick Star Bass
Squier Precision Bass TB