As mentioned this is the cheapest RGB bulb that works with both Alexa and IFTTT (Google Home and Assistant can work through this) available on the market. The brightness is comparible to Philips Hue and these don't even require an additional hub (all for almost a third of the cost of Philips bulbs without the hub). This is an excellent flash sale deal!
$16.89 with Free Shipping
It is confirmed to work with USA voltage after initial setup, but if you would like to be 100% without a single issue you can simply get a very low power inexpensive step-up transformer like this (https://www.amazon.com/Travel-Sma...006NRXXCG/
) and then combine it with any old US to Type-C Europe plug adapter like this (https://www.amazon.com/3-Pack-Uni...01HVUHH7U/
Here is a video of one of the folks getting it to work in the US - https://www.youtube.com/watch?v=ibT-pSImYX0