As it is annoying to have attributes drained and not being able to find the right spell(s) to get them restored I thought I'd make this list. I'm listing 1 location for each, I don't know if there are more than one but after having bought the spell it won't show up again in any other list hehe.
Restore Willpower -> Skingrad Chappel
Restore Strength -> Chorrol (not 100% sure)
Restore Endurance -> Leawyn Chappel
Restore Luck & Personality -> Anvil Chapel
Restore Speed -> Bravil Chapel
Restore Intelligence -> Cheydinhal Chapel
*edit still don't have the agility one but I'm pretty sure that would be in Bruma, just not found the salesperson yet*