Read up about using the 5L mini kegs... IME, they suck (hands down). They cannot withstand much pressure, so you need to be very careful about how you carbonate them. I DID use some for parts of two brews/batches. Due to trouble cleaning them, how they leak (CO2 and brew) and such, I never used them again.
IMO, better off saving the money trying to get those to work and put it towards real kegs.
Hopping Tango Brewery
跟猴子比丟屎 ・ Gun HOE-tze bee DIO-se
On Tap: Caramel Ale, Mocha Porter II, MO SMaSH IPA
Waiting/Carbonating: 12.5% Wee Honey II, 8.9% Old Ale, English Brown Ale, Lickah ESB, Mocha Porter II
K2: Epic mead
On Deck: Caramel Ale
Mead [bottled]:Oaked Wildflower Traditional, Mocha Madness, Blackberry Melomel, maple wine