It is best if the item are expensive but small so you don't have to bring lots of items to the cash register (that have to be put back on the shelf afterward). You don't want to have some employee do a lot of work to get a large, heavy item for you either since their time is wasted.
I have done these at a home improvement store and just chose a power tool such as an expensive drill, etc. "that my dad wants for his birthday".
Shopping across Indiana but mostly around Indianapolis.