cash. seperate transactions for items at various different locations. Dress the part...if your buying gardening related items..wear some jeans and a raggy t-shirt with a bit of dirt making it look like your a landscaper or just a gardener. At the end of all of this...your just another customer buying a random thing in the store to the clerk..i've worked a cash register before..gets quite boring after a few hours...dont notice a damn thing. just take the money and give a reciept