hi there
i use principle secret advance and it has done exactly what it says, i joined the club and got complimentary offer then became a regular member, however if i stillhad loads of product left i just ring them to say i dont need my next supply yet and theyre very good, you will have to go to their website principle-secret.com, but now because i dont have much dosh at mo, i get mine off e-bay but you have to be careful and make sure that the seller is selling the product wrapped in original packing and ask for sell by date, hope that helped
regards