If its got to be a cheap pod machine, Senseo machines are about £28 in Argos. One problem, using two pods in the mug pod holder seems to prduce a weaker brew, I think the two pods don't seal as well so water forces its way past them. My solution, use the single pod holder and just run it twice.
Pod wise they are very common in France, and seeing as we're normally across there once or twice a year we always stock up on some big, 30 pod, bags of pods. Oh, and they're much cheaper too, what you pay for 12 or 16 pods over here, you pay the same in euro for 30 pods. The makes are all french brands but the same brands also sell ground coffee etc, so quality isn't too bad. Darker roasts give a better brew as well IMHO.