This Verbatim 64GB class 10 microSD card used to be £29.99 over at 7dayshop, but is now down to a delicious £17.99 – and comes with a free SD adapter to shove your card in larger slots (not a euphemism).
What can you store on it? The Verbatim 64GB class 10 microSD card can handle up to 12,800 10MP photos, 16,000 4-minute songs, or up to 1,440 minutes (24 hours) of full HD video.
Minimum read and write speeds of 10MB/s.
(Thanks to kash2013 at HUKD)