Does your meal replacement shake contain nutritional information (that lists nutritional profile and ingredients).
If so, you can compare other products against the ingredients and nutritional information on meal replacements online and over the counter.
Each meal replacement plan tries to imply (or actually states) in their advertising that they are the only plan (or one of the very elite few) to trust. That their formula is very secret and very scientifically designed to provide the perfect nutrient balance for weight loss.
After comparing a lot of nutrition labels, I just don't buy it. Many of the otc meal replacements are virtual clones of the expensive, specialty marketing brands. So much so, that there are some products that are likely the same foods made in the same with different labeling (often the specialty programs sell otc food that is obviously identical to what they offer their members-only clients. You can tell because the ingredient list is identical, and so are the nutritional data - down to the same calories, same carb/fat/protein/fiber/vitamin/mineral contents.
So, if you take your shake labels to the store with you (or have it handy as you search online) you can find online and otc products that are similar to what you're using.