Old DFI 6.0 adapter harnesses were around $200. A lot less involved than a FAST adapter. The reason a FAST adapter is more money is because of the time it takes to make one and for the time it saves the end user when he installs it. I take it you have never seen a FAST full harness. It is a mass produced piece that fits no application well but fits alot ok. It would take you a whole hell of alot longer to install a full harness in a Buick and then you would probably end up with a bunch of stuff on the car that doesn't work. If your time isn't worth anything and you want a headache go with the full harness otherwise stop complaining about money and get an adapter harness and make your life easier. If $200 is a major problem than you have the wrong hobby.