Yeelight YLDP23YL 6W E27 ST64 Smart LED Filament Bulb (Banggood, Aliexpress: Luminous Flux: 500LM, Connectivity: Wi-Fi IEEE 802.11 b/g/n 2.4GHz, Lamp Holder: E27, Rated Power: 6W, Model: YLDP23YL, Rated Input: 220-240V 50/60Hz 0.04A, Color Temperature: 2700K, Brightness: 5%-100%, Power Factor: >0.5 (the best price with coupon)).
Price history, coupons and price alert are available on this page. Do you want to know what the best price is?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/feV
Old coupons (from the oldest to the newest): BGYEE2021, BGCuponation10, BGYEEL10, BG10OFFAFF, BGwhielabel, BGLIG12, BG10OFFAFF1, BGYEELIGHT21
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Here is price history (for all/most countries) for Yeelight YLDP23YL 6W E27 ST64 Smart LED Filament Bulb. The lowest price was: $18.99.
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)).