Christmas welcome discount popups

The shipping cutoff. In December “order by the 18th for delivery before Christmas” moves more orders than another discount.

A gift-finder quiz or a popup linking to gift guides by budget turns indecision into a recommendation and an email.

Most stores start at 10% off the first order or free shipping. Test a second variant before going higher: a bigger number rarely doubles signups, but it always costs margin on every first order.

After the visitor has seen enough to care: a few seconds in, after scrolling, or on exit intent. Showing it the instant someone lands from search on mobile is what search engines treat as an intrusive interstitial.