walmart might carry them now. best buy will and so will CC. be prepared to spend upwards of the $135 at either place, save walmart.
again, if you bought the harness for say a 2002 silverado, it would work, except you'd lose door chime and you'd have to run a seperate ignition wire. you service engine light might also stay on, or security light. but then again, i've seen several installs where the data bus wasn't used and everything worked as normal. and if you go this route, you don't relocate the factory radio either.
the biggest difference from data bus to normal harness (save the door chime and some engine code crap) is the ignition wire. a data bus vehicle doesn't use a 12volt signal to turn on the radio, but rather a 2-3volt "data" signal. the harness converts the data signal, by using the constant source, to create ignition voltage.
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