I don't know where to get a better price but I did find this article that you might be interested in
http://www.racesystems.com/
Click on the articles section
Some people recommend you redo the wiring all the way to the battery and use larger fusible links because of the increased current. This guy didn't and doesn't seem to be having any problems but it's some food for thought.
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'88 lx, Black on Black, check it out
here
Spent all my money on school, what a dumb mistake
I'm old enough to know better, but still too young to care.