Thought this looked like a good idea. Was going to buy a regular shovel and drill holes, but, was cheap enough to try the pre-made one. Cheers!
http://www.northlineexpress.com/item/5HY-ASB-KK24/24-Koal-Keeper
http://www.northlineexpress.com/item/5HY-ASB-KK24/24-Koal-Keeper