I just walked into an Autozone store and bought the higher end Carchip for $129.99, thats cheaper than I have seen it on line. If you are going to check your local store, the part number is 8220.

For those not familiar with Carchip, the device loggs OBDII data which you can then analyze on your PC. Check out http://www.davisnet.com/drive/produc...p_products.asp
The E/X model loggs more data types over a longer time frame than the standard model.