Summer weekends fill up fast, especially when you want the kind of vintage popcorn cart that turns a backyard gathering into an event. If you wait until the week of the party, rental companies are usually stripped down to the leftovers. The sweet spot is reserving your gear two months ahead so you get first pick of the carts, machines, and drop-off windows.
A typical popcorn cart and concession setup runs around $400 once you factor in delivery and supplies. That is a noticeable chunk of cash to drop at once, but you do not need to take the hit all in one day if you plan the financing properly.
Keep in mind that an intro rate is a ticking clock, not free money. If you still carry a balance on the Discover it® Cash Back card once the 15 months are up, standard interest applies to whatever remains, so pay that $26.67 every month and clear the slate.