small co2 tank needed

[Monkeyboi]

hi guys i know its abit of an odd one but im after 1 or 2
small i think its about 4 or 5 oz co2 tanks
its for a project im working on
like this
http://www.tysoncolby.name/images/3.5-oz-tank-w-valve-silverl.jpg
any help ????​

 

[Monkeyboi]

anyone ???????????