Those little foam pads you put over in-ear headphones

I bought a pack of six from HMV a year or two ago for 99p, and I lost the second-to-last one yesterday. HMV no longer sell them. Neither do Zavvi (fka Virgin) altho' the bloke was very helpful (he spoke to two other members of staff). At this stage, I was sorely tempted to just buy some more headphones, but they didn't sell Sennheiser MX-500 (the best mid-price headphones there are - my current pair has lasted over two years) so on I marched to Comet. Nope, they didn't sell them either, but the lass referred me to Maplins. Who did sell them - pack of six for £2.49. So I bought two packs.