When I first started with Atkins I spent many hours looking for LC, sugar-free food.

A lot of the prepared food has some form of hidden carb. It is not just the sweet foods that contain sugar. Mayonnaise, curry sauces etc all contain them.
Eventually I found it easier to buy the basics and create simple easy meals at home so I could be certain they were sugar free.

Shopping List for me is basically eggs, meat, fish, chicken (raw which I can cook); nuts Holland & Barratt are great and reasonable, as are a lot of supermarkets. LC fresh vegetables such as peppers, cauliflour and broccoli.

Stay with the diet and you will lose. You are nearly half way there already!
Take care.