You can get 15pcs 1/4inch Shank Router Bit Set for $26.99 using coupon code (in Banggood). You can create price alert here, copy coupons and view price history. Do you want to know what the best price is?
15pcs 1/4" Shank Router Bit Set Milling Cutter For Wood Trimming Slotting Engraving Carbide Woodworking DIY Tools
Latest coupon code price check (UTC time):
Banggood ($26.99)
Banggood warehouse is located in China. I can’t find any active coupons for this product in Banggood. Isn’t it too expensive? Maybe there’re no more promotions for this item, because current price is higher than average (which is equal $21.31)
Link: Banggood product page
Price: $26.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGWDT15
(I don’t think these’re gonna work, but you can try ’em out anyway)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for 15pcs 1/4inch Shank Router Bit Set.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).