A baby would only eat mice hoppers for less than the first 2 months of its life before it can be bumped up to regular adult mice.... So that might be only around 4 hoppers for you, since the breeder will feed it initially. Regular adult mice might last for the next 3~4 months, which would be around 15 regular adult mice. It's still less mice than sold in bulk online.
In my opinion, buying bulk online isn't worthwhile for just one growing snake until he is up to weaned rats at the least, which will be at least around 7 months old, assuming you're feeding weekly. Unless you have an upcoming expo, I'd just order a few F/T hoppers and mice at a time from a local reptile store until many months from now when he's up to size.
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