For only a few dollars, Quaker Pet SuperCat Catnip Crumples ($6) offer a big bang for the buck. With 40 catnip-scented sheets, the intoxicating smell is released when the papers are crumpled and played with. Both my cats loved these, resulting in excessive chewing. Although the crumples aren't harmful if ingested, I wasn't so excited about seeing those bits and pieces of well-loved paper regurgitated around my house.
Quaker Pet SuperCat Catnip Crumples