A good motorized standing desk should last you a decade. You want to buy once, so skip the wobbly budget options and look for a dual-motor frame that can handle your full setup. The big office brands refresh their lineups in late fall, which makes New Year sales the best time to pick up last year's top model at a steep discount.
If you are looking at a $700 setup, you do not have to pay for it all upfront. Using a zero-interest window lets you spread the cost into predictable monthly payments while keeping your cash in savings.
Remember that the 0% intro APR for 15 months on purchases and balance transfers is a hard deadline, not free money. If you still have a balance when month 15 ends, regular interest kicks in on whatever amount is left.