You could put the sub in one of those way-up-high cabinets that have stuff you never use anyway in them. Cut a hole out the top and bam, you're there.
Super cheap option..
Buy a 2.1 PC speaker system with a low-profile sub, put it on top of the cabinets, mount satellites up there too... Then plug into the SB3 with an RCA to headphone adaptor.
I have a set of Altec Lansing 2.1 that was about $50 or so that would work fine in a kitchen... powered, plugs into anything with a standard headphone jack. It gets loud enough for my office which is the size of a midsized kitchen.
-C