The previous deal was expired as the one I highlighted went up in price or Out of Stock.
However, there are various other ones available from £1.15 (use Voucher Code QUIDCODES to get a £5 discount of the stated price)
Think the voucher code expires at midnight tonight and also think for new customers only so might be worthwhile trying different email address and payment card etc if you have ordered before.
Hopefully the link for the deal will take you to a list of the ones still available starting with cheapest first.
Please stop expiring, this deal fluctuates so much
8gb are certainly still available