MyMemory on Amazon. 11p cheaper than (cheapest ever then) last time when I posted over a month ago (£11.86) which went hot but Amazon's own price has rocketed up since to £13.25. I have two of these so far, one from Amazon.co.uk, one from, Base.co.uk. and both are speedy for the money.
When using in USB 3 get 65-75 MB/s read, writes 20-40MB/s.
Best for tablet use and far faster than Sandisk Ultra 32GB micro SD
28June - price increased from £11.75 to £12.45
30th June update - MyMemory is not on list of sellers any more, cheapest price is on Mymemory own web site now @£13.25?
Amazon own selling price now £15.97 gone up yet again!
MyMemory own web site £13.25