youngoldbloke
The older I get, the faster I used to be ...
I expect there was some error in their display pricing, if it is still at that price I would stock up and buy a few cans. Did you actually buy it? Might find it registers at the checkout at 2.99 anyway. If it does you can point out it is priced at 69p on the display and they might charge you that - but I am not sure that they have to 
