You can also buy luna bars at shoppers drug mart by the pharmacy section. You may have to ask them where they are as different stores keep them in different areas.
The hardest part for me with anything is temptation! I find lawl is the best plan out there. Its like following the food guide really. I think the best part for me was that I learned to enjoy fruit. Its not the first thing I want to grab when I want something sweet but as time has gone on, I have started to enjoy eating fruit.
The other important thing to keeping up with lawl is to plan a menu for a week. I usually plan a couple of days at a time because I never seem to stick with a week of menu planning. If you set out what you are going to eat for two days, you will follow it!
Hope that helped,