That reminds me, when I had a place in Ireland I had one of these http://www.vodafone.ie/mobile-broadband/ and I topped it up 20e per month and it was enough to keep me going without having to spend any more. Prices may have changed since then as it is over a year ago that I did that.
I still have the dongle and happy to pass it on for a small sum if anyone wants it. I actually have 2 as I used one for when I was touring and one that stayed in my apartment.