Graduation season gets crazy fast. Decorators book up months in advance for May and June parties, so if you want a custom arch that does not fall apart before the guest of honor arrives, you need to lock in your vendor early.
A professional arch usually runs about $400. That is a chunk of change to drop all at once on party decor, but planning ahead gives you space to spread that cost out over time.
Remember, an intro rate is a deadline, not free money. If you still have a balance on your Citi Simplicity® Credit Card after 18 months, regular interest kicks in on whatever is left, so stick to your $22.22 monthly plan.