There are six wands in I's dungeon. One of them is W of lightning. If you took them to sell, they are still in the store.
Nonetheless, always try Adv's Mart, Bernard in CC, Trademeet merchants.
I hate Item Upgrade - I've been searching for fourth pearl and Scroll of Prot from Acid(mage) for ages, literally. Pearl I found, scroll is nowhere around
.