Sadly there is no such thing as Stella 4.8% anymore. Since November last year it is 4.6% and is the reason I started homebrewing again, to produce something more along the lines of the 5.2% stuff of my youth when it earned its nickname of wifebeater. I started my home bar with commercial kegs with the intention of buying Stella at first. However, I was nervous of being able to drink my way through a whole 10 gallon keg before it went off and so started with a 30L keg of Moretti.
That lasted a few weeks so there was no need to worry about shelf life
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When I bought a more portable cooler from draughtbeeronline it came with a free 30 litre Key keg of cider (that was 18months past it's sell by date, but drank OK). I now have a mix of homebrew and commercial products. At the moment I have Magners Cider, homebrew American IPA and Kirin Ichiban.
Rather than have the commercial 11 gal (Stella 10 gal) kegs in my bar, I use Corny kegs and do a closed transfer from the commercial keg to the Cornies. This makes it easy to swap them around and also take away from home to friends with the portable Lindr cooler.
I'd recommend, depending on space and budget, you either get another 19l Corny or a 10l or 5 L minikeg (Dark Farm do good ones) and simply fill it from the Stella keg. You need a coupler for the commercial kegs, but they are around £30. Stella uses a U type coupler. I initially got my kegs from kegman as they are local to me, but have since found a supplier based in Oldham - Wilds - that has a wider range and more competitive pricing.