I know this is no way near as good as when asda were selling bottles for £30 a pop, but this is the best price i can find online.
It says on the website that when buying a case its £90 a bottle, but then says when buying seperatly its £80 a bottle, so a possible misprice.
Delivery is £5.99
However if you have never bought from Direct Wines (Times Wine Club) then you get £10.50 off your first order when using quido which makes a bottle only £75.49 which is a good £15 cheaper than the next cheapest place.
I know this is a bit of a luxuary and is still very expencive for a bottle of champagne, but if you were planning on buying a bottle anyway then i hope this has saved you some money.