Can't help with the Dr S products (yet). The stuff I use at the moment is :- Bentonite powdered clay in 500gm bags (£4.25 each)- from Herbalapothecary in Leicester tel. 0116 2602 690 (haven't yet found liquid Bentonite anywhere, and am of the opinion that it is much cheaper to mix it yourself in a blender), and Maxicol advanced formula for healthy bowels (Psyllium Husk Powder + Acidophilus and Bifidum) from local health food shop (£14.25). I'm new to this (on day 8 of Ultimate Cleanse) so I don't have a lot of rescousces either but I'm sure I'll find more in time.
Good luck!