[Perfectlap]

Ebay is the best bet for a black three spoke. Hopefully it will come with the airbag.
You can try some of Porsche auto wreckers (probabaly minus the air bag) that will come up if you do a search on this site and Rennlist, porsche pete's boxster board.
The three spoke is my favourite interior item on the Boxster. The notches at 3 and 9' o'clock encourage you to maitain that steering position and discourages me from shuffling the wheel in turns.