I have found this in Coventry's ASDA Instore: Maxell 32GB Micro SDHC card for £2.50. The same were selling for £5.50, a few weeks ago. Grabbed a few of them, as it seems a good bargain. It could be available in other places as well.
Maxell 32GB Micro SDHC card for £2.50 (was £5.50, few weeks ago) @ ASDA Instore