That rental machine is the highlight of the party, but it takes coordination. Summer weekends book up fast, so reserve your spot at least two months ahead of time to lock in your date.
You are looking at about $350 for the rental. If you spread that cost out, it becomes a small monthly expense instead of a large hit to your bank account all at once.
The 18-month intro window is a deadline, not a gift. If you still have a balance after those 18 months, you will start paying interest on whatever remains.