Http://www.budgetmedicines.com/ aka http://www.bmpharmacy.com/
claim: "Lowest Price Guarantee will be matched less 10%" -- of any other supplier of the same item(s).
Their advertising states that an "LPG" claim would result in quick verification of the competing website by a BM Pharmacy employee, and BM Pharmacy would then email a link which the customer would use to pay the "Lowest Price minus 10%". But Credit Card information had to be provided in-advance to prove the buyer's identity.
That was not my experience: although I filled out all the questionnaires and provided a competitors website info which undercut them significantly, and checked the box for "LPG" ... as soon as BudgetMedicines/BMPharmacy had my credit info, they billed my Visa the full amount of THEIR price.
It got worse, but the above should be sufficient warning for the unwary.
Happily my Visa-provider was suspicious and withheld payment until they could contact me.