work for you?
Capital One Spark Cash Plus Business Credit Card - $3000 sign-up bonus on $50k/6 month spend
2% cashback on everything, no categories. $150 annual fee. Can't tell if it hits you with the AF on application, but assuming it does, you'll clear $3850 in 6 months with the $50k spend. That's nearly 8% (back of the napkin calc), which is the highest I've ever seen on a card bonus. This is a GOOD deal. I'd probably churn this and drop the card at year 1 unless they waive AF in year 2.
Yes, this is a business card but the prevailing wisdom is that anyone can get one. You sell on eBay? Congrats, you own a business.