My primary biz is developing/sourcing consumer electronic products from overseas mainly China. Most of the subject products are for car audio, home theater systems and multimedia accessories. However I ran into a contact that sells after-market ignition modules to various customers through-out the world. I reviewed his catalog and found a module for Chrysler, I checked the price..
It was $3.75 each in quantities of 250 pcs, landed cost to the USA including duties, shipping, branding and packaging would be about $4.50. That will give U an indication about how much markup is possible..

Just my $0.02...