once you reach level 60 with a char you can get free stat and talentrespec at r2 / d2 golem, most will know this from patchnotes
this also applies for reincarnations
reincarnations + progenitor share boutique tab
so you can use the respec item for any char you want
this means if you need respec for one char instead of farming the gold you can also just level to 60 (again)