Mouse toys

The best cheap kitty toys (other than homemade ones) are rabbit fur mice. I have yet to meet a cat that didn´t just love a rabbit fur mouse.
Along those lines, you can give your cat a scrap of tanned, processed animal hide/fur to play with. I stress that it should be processed to prevent any bacterial infection from the ´raw´ hide.
Sanitized bird/peacock feathers are also a favorite.