Don't forget about stacking medical expenses with CC churning, even better when stacked with an HSA.
We knocked about $1K off my son's braces using this. We fund a HSA (orthodontics are approved withdrawal) with tax free money. Then the orthodontist gave a $475 discount for paying up front and not financing (with their "free" financing). We opened a Chase Sapphire card and charged the $4K or so not covered by our dental insurance.
So total discounts were: $475, $500 or so Chase sign up bonus - can't remember exact amount - but about that. Then the cash back on the Chase card - 1.5%, so about $60. Then whatever interest is made off the money sitting in the HSA between when we deposited it and reimburse ourselves. Then it was paid for with untaxed money, so whatever money we would have paid income tax on. Not bad.
Even if you can't afford to have the money sit in an HSA and grow over time, this is still a good way to get a chunk off of medical expenses all for less than 1 hour of work.
Our other son has some health issues so we use up our whole year's medical deductible in January of every year. I use this same method - open CC with nice sign up bonus, pay off the bill, get rewards, save receipt to reimburse ourselves from the HSA. Also, you reimburse yourself off the paid bill and cash back or rewards don't factor in. So if you have a $5K bill, but your net is only $4,500 due to a CC sign up bonus, you still paid $5K and reimburse yourself $5K from the HSA.
Something to keep in mind if you will have a lot of med. expenses at once or a big purchase like a root canal or braces.