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They are definitely available - I have two sets on my shelf (just in case I need them).
It was a pretty common thing for some of the performance cam grinders to refinish the journals to be .010 under. Where I've seen it the most is when they took a steel 32 Billet cam core (which ran in the block - with no bearings) and reground it for a performance profile (think Potvin 425) - the journals would be ground .010 as part of the regrind process. I recently saw an original Winfield SU-1A with .010 journals.
I always MIC every cam I put into an engine - to ensure that I don't make the mistake of putting a .010 cam into STD bearings . . . instant major loss of oil pressure and a cam "flopping around" in the bearings.