Hit up your local reptile expos, usually 1 or 2 people have them there haha.
Its what they eat in the wild so maybe there is some type of ingrained instinct that draws them to those if offered, I really don't know. I'm going to be raising them in the next several months but until then I have never fed them to my snakes. I know the little suckers bite hard and often lol and are much more carnivorous than the rats we feed normally.