$0.00 [Cardboard Box]

Free with any online purchase: A Cardboard Box, which just so happens to be one of Lola's favorite things in the whole world.

Jump in and out. Scratch the bottom. Sleep in it. Stalk Kitty from it. Scare Betelgeuse just by having it around. Pee in it when you're done.  

$0.00 for a happy cat, which is priceless.