I belive the reason you arent finding any higher level scrolls is... The game is designed with 7th level as the exp. limit.
Wizards at 7th level can only cast up to 4th level spells according to the paper and pencil AD&D rules. Your wizard should be at what 9th level or so to get his first 5th level spell? I am just taking an educated guess as to the reason the shops only supply scrolls useable by 7th level characters. If you want higher level spells you need to use Dale Keeper to get them.
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