You want a portrait kit that lasts, not a flimsy set you replace in six months. Invest in solid metal stands and high-quality softboxes so you only buy this once.
Retailers clear out old inventory in January to make room for new gear. Look for the previous year’s model; it is usually identical to the new version but hundreds cheaper during the clearance window.
That 0% period is a deadline, not free money. If you have any balance left after 15 months, the card will charge you interest on the remaining amount.