India Ebony, I think much cheaper than gaboon
Brazilian ebony, Not usually totally black but gets close, if you can pick the piece it might work.
Katalox, pretty dark

Guess, I am out voted on wenge being a good riser material.

I still won't use it in large applications, don't have the patience to fill the big pore's with all the other materials available.

where do you guys get your ziricote and other hardwoods?

www.kennyscustomarchery.com
www.tradmaterials.com
www.rosewoodarchery.com


Every one is fantastic to deal with.

There's a number of places that deal in exotic woods but they're not gonna necessarily have pieces that are riser sized cuts. I'd stick with the above

Cabbage's vacuum chamber idea has had some really nice results.

black actionwood or dymnondwood. wenge is dark but not black (i wouldn't use it either Walt)