Update: Sold out.

Pack of 150 Mead Filler Wide Ruled Loose Leaf Paper – Link

Amazon has this currently marked own to its lowest ever at only 99¢.

• Filler paper is a perfect choice for all your notetaking needs. Filler paper is 3-hole punched with 3 holes for easy insertion in a 3 ring binder.
• White paper; 150 sheets. Full page size of 10.5 in. x 8 in.
• Sheets are wide ruled and double-sided to provide plenty of writing space.