Do you have shows near you? I bought several 10 count bags of mice at our last one, for about the cost of buying 10 from the pet store, and they've lasted Wadjet nicely. I don't know that they'll last until May, when the next show is, but it's dropped the cost of having a pet snake quite low.
I haven't yet found a good way to get feeder insects cheaper, though-when I bought in bulk at Repticon, the "small crickets" were escape artists. The cats loved it, because they had lots of insects to stalk and chase, but relatively few made it into frog stomachs. They didn't LOOK smaller than the pet store ones that I'd been buying, but apparently they were.
--Donna