My wife is on a tremendous "Cat Kick" right now. She finds things on line, and wants to order them for our cat Roger. The good news is, she's pretty sensible, and resists ordering most of them. (Except for those cat flip-flops)
Here are more ridiculous cat things you can, but shouldn't order.
Inflatable Unicorn Horn.
A cat crib
Cat toothpaste dispenser
Cat Butt Coasters
"Wine" you can share with your cat
A cat wheel
Cat bed shaped like a slipper
A tiny armoire for your cat's wardrobe
A tree for your cat
And finally..."Puss Week Magazine."