Absolutley. I will take all the 3.9% money(on car notes, run the numbers, it is often better to take 2-4% than it is to give up the rebates at 0%), and the 0.0% money they will give me.
I buy all of my electronics once per year at Best Buy on a 12 month no interest note. Not much, $1000 bucks a year, but it is free use of their money.