Madeline, Amcal is the name of the Chemist, so you wouldnt find them at Chemist warehouse
and Tony Ferguson shakes are only sold at Terry White Chemists, Celebrity slim is only sold at Priceline.
Thats the catch I think! Chemist warehouse is where I get my optifast from, (they also stock something called optislim, which is the same nutritionally as optifast, and at my Chem. Ware they currently have a 2 for 1 sale, 2 boxes of optislim for $50, VERY cheap! So I bought that) Good luck mate