Aliexpress
Click here… to search for Xiaomi Aqara ZNLDP12LM LED Smart Bulb E27 on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
Coupon (28.22 USD): 00c906
(CouponsFromChina.com tip: this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): e2bcea, 502C6B, DPT258, TTxBG10, AQAXMA, BGBULBAQA, BGss8%hl, AFfbG10, BGplswiatlo2, BGNOVLED, BGAQARE, BGLIGHT2020, BGAQA15, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgshOOp10, BGLIGHT0920, BgoFErTaSchInA10, BGELIG0920, BgcLuBofErtA10, BGAFF10OFF, BGCuponation10, 13f142, BGHONEY2110, BG10OFFAFF, BGwhielabel, BGLIG12, BG10OFFAFF1, BGAQA929
(probably won’t work, but you can try them out)
Price history and price alert
Price history (for all/most countries) for Xiaomi Aqara ZNLDP12LM LED Smart Bulb E27 is here.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).