You need to live closer to Houston! I have extra packages of adult mice, jumbo mice, rat fuzzies, and rat pups! I bought extra when I bulk ordered and now I don't need them. I have so many extras! If you plan on going to Repticon Houston, you can always hit me up.
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To the OP, you want to feed them 10%-15% of their body weight. Hoppers are BARELY 10% so you can go ahead and give them weaned mice or adults. Even though adults might be a little big, you can always give a longer resting period between meals and it'll be fine!