Hoppers are mice that are about 10-14 days old. They look like fuzzies, but with a fuller coat. Hoppers kind of jump around when they're excited which is where they get their name. You can get them off the Internet for sure, a lot of people here use rodentpro.com, although I would recommend themousefactory.com because of good rate, awesome quality and good service. Shop around for yourself if you want, and keep in mind that the munson plan is good, but if you're snake isn't large enough you shouldn't force a bigger size prey (although 64 grams is probably large enough).