I like to use vertical ruled index cards in my campaigns. Available from Staples, the Oxford “padded index cards”  are tear-off pads of index cards with the lines oriented in portrait not landscape mode. These come in handy for a variety of things:

  • NPC Stats
  • Scratch paper for notes
  • Folded over for secret notes to players

Here is the information to find them at Staples:

Oxford Padded Index Cards
Ruled Tear-Off Pads
100 5?x3?
White Item No. 006351 (Esselte Corp.)