I've got 4 or 5 of these Mini Kegs that i never got around to setting up, which I might look to sell in the near future. I'm not using any more than the 4 that I already have set up.
Check out the photo's on page 2, the remaining ones are all of the shorter style, which hold a little over 3.5L
They would obviously need the adapters made - by Gameco or similar - as I haven't done that. they cost me about $10 each plus postage - and then the male gas post.
PM me if anyone is keen - with a decent price! But they will go on Ebay soon... to the keenest of party going keggers.
Will post the ebay link when i get around to it.