As was mentioned by both Ed and Dane a pressure cooker and autoclaves are just a wee bit on thje expesive side for anything less than regular use.
I use a poor mans method, that has worked for me to date:
I use boiling salt water, and then rinse several times with normal boiling water to get rid of salt residue. By doing this I rely on two thing to get rid of nasties, the first is the high temp (i.e. Boiling water) and the second is Salt osmosis.
Salt osmosis will kill most organisms that are not useto a high saline liquied enviroment.
"Be Reasnable, Ask for the impossible"