I believe it is only the quit game/restart that is necessary, but will do further testing to try to identify this. The vendor may need to reset, and you may have to completely quit out of the game and restart if you obtained the necessary skill level in this play session.
15 for Apprentice, 40 for Adept, 65 for Expert).
On the PC version I'm finding that spell tomes are consistently available from vendors (assuming they have the spell tome at all) when your skill is 10 below the number needed to purchase the spell level perk (i.e.
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