Tubes for MTB Rev-X Wheels

Hello all,

Trying to sell my (ridiculously underused) bike, but I realized that I
might have a small problem. I've got the old, now-discontinued
Spinergy Rev-X wheels and it occurred to me that I can find neither
tubes with a long enough valve nor the valve extenders I used to use in
a pinch. Does anyone know of a source for either? Thanks, much
appreciated.

While we're at it, I guess I should say that if you're interested in
buying a 2002 Stumpjumper FSRxc Comp that has seen less than 50 miles,
all road, drop me a line. Thanks.

Dennis