Possibly sold on
Steam,
Amazon.co.uk and
Amazon.com via digital download. However, I don't know if this is the Dreamcast version (being emulated, of course) or the PC version.
More straightforward, the PC version is sold on
Amazon.co.uk; also, possibly sold by
ValorBooks and
Tired Fingers, assuming they meet Abandonia's standards.
Given the confusion, I'm not going to make a
[REJECTED] or
[INVALID] decision until someone can confirm whether the downloadable version of Crazy Taxi offered by Amazon and Steam are, in fact, the PC version of the game.