Dell is found now on some shopping portals at increased rates:
Topcashback at 11%, today only (6/20/23)
Rakuten 10x
See all rates here
The Amex Business Platinum $200 credit resets after June 30th and it’s the last chance to use up the credit now and have the item ship and charge post before end of month. There are also some Amex Offers for Dell; check if you have that on the Business Platinum card as well.