If I wanted to buy a card protector for every card in Arkham Horror (and expansions), how many would I need of each type?
You will need:


Set                     Investigator   Ancient One
Arkham Horror              189             179
Curse of the Dark Pharoah   76              90
Dunwich Horror             152             180
The King in Yellow          76              90
Kingsport Horror           112             207
Black Goat of the Woods     90              88
Innsmouth Horror            96             176
Lurker at the Threshold     56             110
Miskatonic Horror          112             336

Total                      959            1456


According to the Fantasy Flight Sleeve Guide, that equates to 20 packs of Mini American Board Game Sleeves and 30 packs of Standard American Board Game Sleeves if you have everything.