I would not exactly say they are meant for auto use. More like they are usable for auto use and are sold for that.
IIRC the Aurora Auto PC (MSRP $1699 US) is just a EZgo E7041S barebones they are $549 from directron
http://www.directron.com/ezgoii.html you can get everything added on except the DVD drive (P4 2.0 insted of the celeron 2400) from directron for a total of $1127.99 (built and tested) and I am sure you could pick up the touchpad and DVD drive and touchpad and digital dash software(from gnetcanada) if you want it for less than $500.
I am also sure you could get ome of the parts cheaper than getting them direct from directron other places but I dont have the time to look right now.
The other PC they offer is the same sort of deal. I don't know who makes that one for sure but I am sure a little looking would poke it out.