I am fairly certain that I have seen them there before. Supply depends on time of year for breeding, clutch sizes, etc.. I usually just call them about particular species I am looking for. If they don't currently have it they usually have some kind of idea when they might get the next batch in.
If Josh doesnt have them, he can refer you to someone who does. Winter can be difficult to find though. Cluches are usually more spring ish, and the half yearlings are usually sold by the fall shows. But ask Josh, he knows reputable breeders
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