FYI, a good commercial brand I've bought that works as well as MH's (at least for me), is Colon Cleanse by Nature's Secret.
However, probably not as good for you. Commercial products tend to be irradiated and have other contaminants. In a pinch, if I didn't have MH's I'd recommend this brand.
In the future, I'm going to be making my own from an organic bulk herb supplier. I just have to find and buy unpolluted capsules. In the meantime I thankfully still have 1.5 bottles of MH's 550.