If you have a Kindle, you should have a look at Amazon’s current The Twelve Days of Kindle promotion. There’s a nicely large selection of books with prices starting at 99p – and some of those were around £6.99 previously, so there are some actual bargains on offer.
For instance, I just bought The Horologicon, Mark Forsyth’s follow-up, or companion volume, or something to his excellent Etymologicon, which I enjoyed enormously. I’d been thinking of buying it anyway, and the 99p offer made my mind up for me. I also got a Neal Stephenson novel for 99p, also nicely reduced.
Standard disclaimer applies – I get a cut if you buy anything via an Amazon link from this site.