SPELL LOCATION SPOILERS
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You're right, WK, Ribald does not have many spells ... BUT the lady at the back of the Adventurer's Mart has a good selection.
Also try - Spell store above the Mithrest Inn (Waulkeen's Promenade)
There is a thief just outside Waulkeen's Promenade (night time only) under the arches at the eastern side who has a good selection of spells, especially summoning spells.
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Time is an illusion. Lunchtime doubly so.