Ok they are second hand, but if you are looking for some old music to load onto your iPod/mp3, then you could bag a bargain.
There are dozens of albums available for under a £1 with some as little as 20p, and that includes delivery (less than the cost of a stamp!) When you search, remember to click 'available to buy online' and search by 'low to high price', it does appear that most of the titles are under Rock and Pop.
Amongst others, I found albums by the following, all delivered for 50p:
Minimum Total Order Value is £2.00