Dums range anywhere from free to several hundred dollars. If you look online you can find well-established, feeding baby Dums for $125-150 plus shipping so $225 at a retailer for a known-quantity yearling isn't out of line.
Most pet stores don't provide the best conditions for getting a baby snake to eat; even if the husbandry is on point the stress from retail activity can throw them off food. Baby Dums in particular can be shy about feeding. If you think one of the non-feeders looks nicer and you want one, ask for a discount and swear to keep your mouth shut about where you got it if anyone asks.
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