Amazon.com : Avery Durable View 3 Ring Binder, 1/2 Inch Slant Rings, 4 White Binders (03362) : Office Products
Amazon.com : Samsill Plant Based Durable 2 Inch 3 Ring Binders, Made in The USA, Fashion Clear View Binders, Up to 25% Plant Based Plastic, Assorted 4 Pack (MP48669) : Office Products
OfficeMax Durable Reference Binders with Round Ring 1-1/2", Blue 5 PACK | eBay
Avery Durable View Binder Multipack, 1.5 Inch 3 Ring Binder, Assorted Colors, 4 Pack (05687) - Walmart.com