well u build it yourself, or u have to get a m8 to if ur unable, using instructions found on the internet.
http://www.megasquirt.info/
u can order one thru there, or from Glensgarage.com
costs around $350 depending on exchange rates and takes around a month and a half or 2 to get here because of waiting lists.
if ur serious about getting one, i have one that i bought at xmas time (ordered in november) still in unopened box as i got a link ecu in the time that i was waiting for it to arrive, ill part with it for $300 as i paid $327 + postage and i havent opened it as i planned on reselling.
0276973722 if u wanna get a hold of me