age is irrelevant as long as you get a Bp from a good breeder... you want one that is eating already. most good breeders won't sell hatchlings until they are eating.
I got these 2 pastels from Justin Kobylka back in November
http://www.jkobylkareptiles.com/
he doesn't have any listed last I checked, but he didn't when I got my 2 either. shoot him an email. he might not have one right now but eggs are hatching so he will soon.
Other good places to look into are:
http://newenglandreptile.com/nerd/
http://pythonregius.com/
http://www.ralphdavisreptiles.com/
http://www.bhbreptiles.com/
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