A good standing desk frame and solid wood top should last you a decade, meaning you want to buy it once and skip the wobbles and motor failures of cheap particle board. When you invest in a modular setup, you are paying for thick timber and heavy-duty steel that will outlive multiple office redesigns.
We wait for back-to-school sales in August to pick up these parts, as brands drop prices right when college dorms and home offices restock. If you want to save even more, look at the previous year's frame models right as the new versions launch since the mechanical upgrades are rarely worth the extra retail markup.
Remember that the 0% intro APR for 15 months on purchases and balance transfers is a strict deadline, not free money, and any remaining balance when those 15 months end will get hit with standard interest charges.