went to my local asda Hollins road Oldham and they had box tissues on sale. just sale not reduced to clear, the pocket tissues were 42p, the twin pack velvet was £1, the blue box was 50p.
they also had asda brand tissue box on sale for 67p. as Kleenex worked out cheaper and better brand it was better to get those. various Kleenex tissue boxes on sale even the man size ones. not sure if national.