You want a pair of noise-cancelling wireless headphones that block out the world and actually last five years instead of falling apart in twelve months. Buying once means you skip the cheap pairs that die in a drawer and go straight for the gear you won't want to replace.
January is the sweet spot for tech clearance because stores are clearing out last year's models to make room for new releases. That means you get flagship sound quality and top-tier noise cancellation at a steep discount just because a newer version hit the market.
Remember that the 0% intro APR for 15 months on purchases and balance transfers is a deadline and not free money. If you still have a balance left when those 15 months run out, interest will kick in on what is left over.