Thanks Jeff for the info. I am looking into this because I want ms. Emily to join me out on course. So far I have found it to cost about a couple of hundred dollars. Granted I am having the artist help with the design.
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if you can only race me in a straight line then whats the point 
...91 SMF SCCA
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by http://www.flickr.com/people/8341770@N07/, on Flickr
I see people out there spending money on the car to improve it … If you spend half that effort just working on your driving skills, making you and the car work together as a team, then you’ll go faster – period. To make the car go a second faster on the track takes a lot more energy and money than making yourself drive it one second faster.
– the late Tom Thrash SCCA Solo E Production