You may be able to find this at FRY’s or elsewhere on the www, else goto:
You should get:
Boe-Bot Full Kit:
Price: $229.00
This comes with everything we will need so ordering will be easier and you can just get this but you will pay a little extra for the cd’s, manuals.
http://www.parallax.com/detail.asp?product_id=28132
If you really have trouble with the price you could get only:
Price: $119.00
http://www.parallax.com/detail.asp?product_id=28102
Send me an email and we can probably sort out enough extra parts for you to get through the tutorials.
Also:
Here is a list of all sorts of sensors you can get down the road so keep these in mind for your “applications”
http://www.parallax.com/html_pages/products/componentshop/sensors.asp