Anything autoclavable can be used over & over again. A pressure cooker is the next best thing to sterilise your tubes in.
Failing that, you can do what I do & boil the clappers out of them (And the lids) for at least 30 minutes in a pot.
There's another one where Franko found a container that looked OK and then someone else came up with a slightly better alternative, but can't find it at the moment, perhaps a search on Yeast storage would reveal something.
I bought mine from http://www.wiltronics.com.au/catalogue/shop.php?cid=172200. They were very helpful and provided good service. You can also find them on Ebay. Not Affiliated <--- Hmm, do I have to say that every time I recommend someone?