Sry to hear of your losses...make every second count and use that misfortune as learning tool. Its good you picked an active one, my first and only Petco beardy(nine) was just like that. Hes huge and healthy to this day.
He looks good and the poop does too, but if u see a good amount of yellow in it in the future, get to the vet asap if you have the money.
Given my recent experience, id bring your new one to the vet for a checkup, just in case. No matter who you get it from.
Good luck! And enjoi !