You can find a few on MorphMarket and FaunaClassifieds. There aren't many available right now because they usually breed in spring and give birth in the fall. Most of the ones for sale right now are from last year. I'm expecting a litter next month, but that's just because my girl went early this year. In the past she's given birth in August and October.
The only other breeder that I've had personal experience with is Ryan Shatto. He usually posts ads on FaunaClassifieds. I got two lovely Anery Magdalena Plains rosys from him last year. They were in excellent health and ate right away for me. I haven't seen him put up any ads yet this year, but I would highly recommend him to anyone looking for rosys. If you aren't in a hurry to get your new snake he is definitely worth the wait. Here are the babies I got from him:
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