www.dddhouse.com in Hong Kong sells it for about $40HK, which is just over $5 US, although it's probably cost another $2 or $3 to ship. This place is quite reliable. I've used them for literally hundreds of discs over the last few years.
http://www.dddhouse.com/dddhouse/en/index.jsp?action=productDetail&productID=256

LEGEND OF SPEED is actually a sequel to the 1995 motorcycle racing movie FULL THROTTLE, starring Andy Lau. The characters and story of the two films are unrelated, but you'll notice a "2" in the Chinese title of LEGEND OF SPEED that indicates its status.
http://www.dddhouse.com/dddhouse/en/index.jsp?action=productDetail&productID=3236

If you like LEGEND OF SPEED, you might also try

OFF TRACK (1991)
http://www.dddhouse.com/dddhouse/en/index.jsp?action=productDetail&productID=1521

and it's sequel
HIGHWAY MAN (1995), starring Julian Cheung and Anthony Wong.
http://us.yesasia.com/en/PrdDept.aspx/pid-1000030215/section-videos/did-106/code-c/version-all/
This last one is out of print, so it might be trickier to track down, but it's a decent racing movie.

Just remembered another one, Gordon Chan's THUNDERBOLT (1995), starring Jackie Chan. This one's a lot of fun, although the final race sequence is marred by camera undercranking and implausible stunts. One of Jackie's greatest fights is in this movie - a battle with Yakuza gangsters that trashes a gigantic pachinko parlour.
http://us.yesasia.com/en/PrdDept.aspx/pid-1002531656/did-0/code-c/section-videos/

ALL ABOUT AH LONG is another one if you don't mind melodrama (I don't).

Does anyone have news on when the Mei-Ah remaster is due?