A wand of wishing is an exceptionally rare wand which grants the user a wish when zapped. Due to the great value of wishes, wishing wands come normally with only a single charge (sometimes up to 5), though a scroll of charging can be used once to add an additional two charges (subsequent chargings will cause the wand to explode). It is a good idea for your first wish to be 3 blessed scrolls of charging (unless you have one already).
A Wand of Wishing's base price is 100 + 20(number of charges).