A good robot vacuum and mop combo keeps your floors clean day after day without you having to lift a finger, and a well-built model should last you four or five years if you keep up with the basic maintenance. Buying the right one means you are investing in a machine that actually maps your rooms and avoids getting stuck under the couch, rather than a cheap one you will end up replacing in twelve months.
You want to wait until the spring cleaning sales in March, because that is when retailers slash prices on last year's hardware right before the newest models hit the market. Last year's top-tier machine usually gets the exact same software updates as the brand-new release, but costs a couple hundred dollars less.
That 0% window is a deadline, not free money, so make sure the balance is fully paid off before the 15 months are up or interest will hit what is left.