Some cheap flash memory items over on Amazon at the moment. Easiest way to find them is to search "bytestor" in electronics section of amazon.
Bytestor USB 2.0 Flash Drive 4GB - £13.16
ByteStor 4GB SDHC Class 4 Memory Card - £11.46
ByteStor 2GB SD Card - £5.22
ByteStor 1GB SD Card with card caddy - £3.86
Bytestor USB 2.0 Pen Drive 1GB - £4.54
ByteStor USB 2.0 17-in-1 Multi-Card Reader - £2.99