Electric Upright Bass Database

Lemur Music has some. (they sell bass stuff only, in case you don't already know)
Their web site with on-line catalog and store is at www.lemur-music.com.
Here's an excerpt from their on-line catalog:

Ebony Fingerboards (shipping $6.00)

Good fingerboards are hard to get. Lemur now imports all fingerboards from the highest quality European manufacturers.
Excellent quality wood, finely machined and finished, full dimensions, and no dye. We try to keep a complete stock of round
and beveled boards.

            A1300 Ebony fingerboard, excellent quality, 3/4 round 345.00 199.00

            A1300B Ebony fingerboard, excellent quality, 3/4 beveled 345.00 199.00

            A1303 Ebony fingerboard, flawless jet black, 3/4 round 405.00 256.00

            A1303C Ebony fingerboard, flawless jet black, 3/4 beveled 405.00 256.00

            A1303A Ebony fingerboard, flawless jet black, 4/4 round 436.00 266.00

            A1303D Ebony fingerboard, flawless jet black, 4/4 beveled 436.00 266.00

            A1303B Ebony fingerboard, flawless jet black, 4/4 5 string 450.00 276.00

The price at the right is your price.