Phone APP Voice Control, 1880K-7000K.
Just check coupons out (with price alert and history). Best price?
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 coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. As you can see I didn’t find any active coupon for this product right now…
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!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGWeld, AFfbG10, BGMIJIABULB, BGLED662, BGPHILIP4, BGBFAFF2019, BGCITYADS2019, BGXMAGRB, BGLIGHT2020, BGTT10, bGhOnEy10, BGYEBWCN, BGAFF10OFF, BGCuponation10, 13f142, BG10OFFAFF, BGwhielabel, BGLIG12, BG10OFFAFF1, BGd0b05d, 00c906
(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 Xiaomi Mijia E27 RGBW LED Bulb 2019. The lowest price was: $12.99.
Price records source(s): Gearbest, 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)).