Die, die, whether you like it or not, during the encounter with the Corrupted Harpers in the Harper's Stronghold( after their leader questions you), the Harper Wizard will always drop a Ring of Wizardry.
Wizard PCs can take advantage of this by getting 2 Rings of Wizardry( RoW), or if they have the Item Upgrade Mod, a Sorcerian Ring + RoW.
There might also be a RoP+2 among the other corpses, but I will leave it to those more familiar with this encounter to say aye or nay.