Best price I've seen for these for a while (they were as high as £8.25 recently with Amazon, and are £8.50 and £7.50 at Debenhams and John Lewis still).
I'm sure some people will say "£3.80 for 30 bin liners??? Madness!"
But until you've bought these, you won't appreciate the difference. They fit the Brabantia bins perfectly, and we've never had one split on us in 4 years.
so if you own one of the 40 or 50l bins, they are worth getting at this price.