Whether you purchase adult frogs or froglets, you should still quarantine them for a few weeks, either calling it a nursery or a quarantine tank. This is just so you are keeping them in a small container to make sure all are healthy and eating well before you turn them loose in the planted habitat. It's no big deal, and can be done in a critter keeper modified for humidity, or a plastic sweater box with a damp substrate or wet paper towels. Purchasing breeding pairs or guaranteed pairs such as is recommended with D azureus if you are starting out with these, is more expensive and frankly not as interesting.
In any event, Saurian (Patrick Nabors) will work with you, give you advice, and Black Jungle is also a great source of healthy frogs. There are others that are probably equally as helpful, but I haven't yet had a sales experience with them personally. I think that most commercial breeders are honest and have guarantees.
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Patty
Pahsimeroi, Idaho
4 D. auratus blue
5 D. galactonotus pumpkin orange splash back
5 D. imitator
6 D. leucomelas
4 D. pumilio Bastimentos
4 D. fantasticus
4 P. terribilis
4 D. reticulatus
4 D. castaneoticus