Rabbits can be a cheap alternative to chests. 
All you need is one
carrot per rabbit.  

They will follow you, to but it's advised that you still don't let them roam wildly. If a rabbit follows you and gets lost along the way, just retrace your steps. You will not need to feed them again. Remember that this cannot be done with any other mob. 00:18, February 3, 2013 (UTC)RandomMcSomethinGuy