I was just going to buy a few packs of supermarket own brand cups. I got some last year for a music festival and they were grand. I think they were 150ml cups and cost me just €3-4 for 50.
I'm off work in a couple of hours and will see what the supermarket have. I'll get a few packs of cups, and sure if anyone finds better tasting cups, I can always use the leftover ones for a music festival this year.