There are lots of vendors who offer an instant rebate or discount on all transactions, while there are sellers who market an item at its regular price but include "free" bundled add-ons. It is suggested that you simply buy from merchants who actually don't always stick to the minimum advertised price (MAP). The acknowledgement of credit cards whenever paying for goods is a technique that helps to protect the buyer since credit card companies can help deal with disputes, like when a vendor does not deliver an item as promised.