You choose what you want and take it to a cashier at a register, and then pay for the item by cash, check, or credit card. If the shopper needs help in making selections, you can ask a sales clerk for assistance. In most stores prices are fixed. One cannot bargain for a lower price. The advertised price does not include taxes.
Newspapers advertise sales.
A sale is when merchandise is sold at a reduced price. Newspapers also have coupons, which allow you to purchase an item at a reduced price. Whatever you buy will have sales tax added to the cost of the item. Sales tax is not included on the marked price or price tag. Using checks is also convenient.