A photo booth is the heartbeat of a great party, giving guests something to do and a souvenir to take home. Getting the timing right is your best way to save money and ensure the vendor you want is actually available.
You should secure your booth as soon as the date is set. Once you have a quote, use this plan to manage the $750 cost without needing the cash in your hand today.
The 0% interest window is a deadline, not a gift. If you still have a balance left over after 18 months, the bank will start charging interest on whatever is remaining.