Ive just bought my kitten a pop up cube...another member made a post showing it and at £2.99 it's a bargain. Got it off Ebay, it arrived today and my kitten hasn't stopped playing with it....it's really great:

BLUE CAT & KITTEN POP UP PLAY CUBE *ULTIMATE FUN TOY* on eBay, also Toys, Cats, Pet Supplies, Home Garden (end time 08-Dec-08 21:28:00 GMT)