You can use the Atkins shakes, ready to drink, very tasty.
Or, a bit cheaper and heavier on protein and vitamins/minerals, the EAS carb control shakes. £20 or so for 12, free postage, they come in chocolate or strawberry.
I get them from a site called Bodybuilding Supplements. Make sure you get the carb controlled ones. They also do a 20g carbs shake but I think it is for those wishing to bulk up! Ha not quite what we need...
I have used the Avidlite ones and they taste very nice but they are not intended for use as meal replacements and they are tiny. The EAS shakes are bursting with nutrition. This is the difference. The EAS and Atkins shakes contain much more liquid per carton, too.
I use the Protimeal porridge now and then, tasty and filling and only 2g carbs per sachet (5g carbs for the sweeter ones). Nice on cold mornings!
I've just purchased one from Holland and Barrett after a recommendation from a friend. Huge tub half price at £12.99. Was a bit sceptical but its lovely I got the vanilla flavour and really like it. Its 1.6 carbs. x
I also bought the Holland & Barrett and am using Cambridge Diet Mix a mousse to make them into mousses (also SF jellies mixed with them to turn them into puds). The choc one is not the nicest - I have to add a bit more cocoa some Splenda to make it anything like decent. Will have to check out the cookie recipes