Hi MessyJessy – sorry no-one has picked up on your question yet, but welcome to the forum. Unfortunately I’m not Antipodean based, so don’t know what meal replacements might be available to you, however, I can say that many of those available in the UK are very high in carbs with a scarily large portion of that coming from sugars. I imagine this is probably the case with these products across the globe, so I think some online research and reading nutritional labels is a must before deciding on what to use.
Could I ask why meal replacements rather than actual food? Really, it is much easier to control both the calories and carbs if you are eating proper non-processed food, so if you think you could go that route, I’d strongly recommend doing so. However, whatever you decide to do, please keep posting and making use of the forum. Best wishes to you for your start on the BSD and I hope to be reading of your positive results soon.