A good mirrorless vlogging camera kit is an investment in your content that should easily last you five years or more. Buying the right setup now means you skip the upgrade cycle and actually master the gear you have.
Spring is the sweet spot for buying because camera brands drop their latest models and mark down last year's proven gear. You get the exact same video quality for hundreds less just because the box isn't fresh off the factory floor.
Keep in mind that 0% for 18 months on purchases and balance transfers from date of account opening is a deadline, not free money. If you still have a balance left when those 18 months run out, you will get hit with interest on the whole original amount.