I hope you find some. I've just had to pop into town & saw Holland & Barratt do them too, if that's any help. Don't know the price as they weren't marked up, sorry & I didn't ask...duh!
But... noticed they had a different Olina's cracker, Bakehouse Pumpkin Seed Flatbreads. They are long ones, 5 in a box & are 0.4g carbs per serving, £3.29.
Anyway, rather knacked after town with a heavy arm after having Cov jab, so an easy dinner of some ham & cheese with either some Olina's or a SRSLY roll, haven't decided on that yet.
ETA: Sorry you've been knocked down with migraine, MrsA2, hope you recover quickly. Have something you fancy that is easy & let the boys fend for themselves would be my plan.