(Mixed feeling on location - lvl 9 makes more sense for the "slayer" idea but surely would be sweet to have better goodies before hitting 8!)
Harm scrolls. They're never available needed, and no well-equipped magic wielding adventurer should leave home without them!
Potions in sets of 10. Heck, scrolls in sets of 10 - or at least more than one - would be nice.
Z has done such a job at stocking the other stores with the usually favored weapons (and a few of the plain-jane unusuals), so why not make the more unusual available in their better-built variants? One can only equip so many longswords, scythes, greatswords, maces, etc. without beginning to long for something more exotic: Nunchacas of Nonsense, Goads of Goatiness, Light Hammers of Darkness.
And then, of course, perhaps the Flind assistant might do a little tailoring on the side and 'custom' provide Mittens of Appalling Softness, the ever popular Dressing Gown of Seductive Death (+persuade and AC), Brilliant Diadem (+Int - or just Searing Light on hit
), and the exceedingly rare Fluffy Bunny Slippers of Doom.
....going back to her caffeine now....