Heh, I keep a box of single serve UHT milk cartons in my fridge just for making coffee on the weekends, and the occasional recepie. It's a little pricey at about $1.10/8oz carton, but at my consumption rate I'd be throwing away most of the 1/2 gallon jug anyway, which typically costs more per oz than a full gallon.

I don't find it as good as non-UHT milk, but it's definitely worth the convenience of always having milk when I need it.