Yeah, this is an SDHC card (as opposed to our usual mobile-related microSD), but I’m posting it anyway. Shut it. Locoisle777, via Amazon, is selling this SanDisk Ultra 16GB class 10 SDHC card for £8.59.
Alternatively, the 8GB is £5.60, 32GB is £17.04, and 64GB is £33.62.
(Thanks to Purps at HUKD)