I breed some of my own feeders as well, and in my experience, you won't be saving any money. Rodent block ($25 per 50 lbs), bedding ($5 for 6 cubic feet), caging ($$$depends on rack or cages), cleaning supplies (I sanitize weekly with Chlorhexadine), etc. Every week I spend more time on the upkeep of the rats than I do my 17 bp's, 1 rtb, and 1 hognose.
It IS convenient to have snake food available at all times, though! (sometimes I feed at 2 am when the balls are more active).
I've been breeding feeders for about 2 years now.
Either way, good luck!!