Hi, you should try the Quick Chop.
I have one that I chop my iguanas broccoli, coliflower, and carrots with. It is so much easier and a heck of alot faster than using a knife.
Just throw some Kibbles in there, press down on the chopper with a slight twist once or twice until its the right size and vu ala, small bite size kibbles!!!
Heres the site I got mine from,
http://www.we-save.com/quick-chop_a.htm and trust me they dont get cheaper than 9 bucks.
But if you dont want to buy online try Wal-Mart, target or Walgreens!!
Well hope this helps!!