Bing shows a coupon element in search results. I Searched Green Tea on Bing and it is showing Coupons for tea in search results. The result is shown in a carousel format.
Also, I noticed the results are updated at regular intervals of time. As in the below screenshot, you can see the last updated time as 22h ago.
Bing has listed multiple stores with coupon codes. For more deals, you can click on the stores listed under the coupon section.
Here is another example
Bing Tests Coupons In Search Results for Branded Keywords
Bing already implemented coupons in search results for branded keywords. If you search brands like Nike on Bing, you can see a coupon element in the search result snippet.
Here is the Screenshot
It also shows the number of coupons available. If you click on the coupon element, you can see the coupon codes. You can copy the coupon available and land on the destination page.