Hello @Seller_dSgd6E3rsw8Aj,

Thanks for posting here. A Best Deal is a time-bound, promotional offer where an item is featured for a limited number of days on the Amazon Deals page. A Lightning Deal is a time-bound, promotional offer where an item is featured for a limited number of hours, usually 4 to 12 hours (as determined by Amazon), on the Amazon Deals page. You may also read more about some of the nuances here.

Kindest regards,

Veronica_Amazon