Just stopped by Sainsburys and picked up a couple of cans as I have not seen any other deals on this for ages.
Suremen 250ml sprays, all types for £2.41 each or 2 for £3..... No idea if online as well as only went into store..... (EDIT - just seen it is online too!)
If anyone knows of cheaper more regular deals for this (excluding the northern stores!) then please let me know as I use a lot of this lol!
EDIT - sorry no idea if national or not either, but as these are not a perishable item I guess there is no reason it is not other stores too?