Tim the Tiny Horse & Tim the Tiny Horse At Large in hardback for only £2!
They also have Harry Hill's Whopping Great Joke Book but personally, I found that it contained too many cringeworthy jokes. Also of interest is Ricky Gervais's Flanimals of the Deep.
These are all part of the "Buy 10 x £2 books for just £16! Save an extra £4!" offer - loads of bargains to choose from and free delivery if you spend over £25.