Walmart offers the Sylvania Smart+ ZigBee Indoor Flex Strip Starter Kit for $35.99 with free shipping. (Amazon has it for the same.) That's the lowest price we could find by $9. It includes three 2-foot flexible RGBW strips with color changing and is compatible with SmartThings and the Amazon Echo Plus.

Note: The ZigBee Certified Gateway hub is required for this these lights to work but not included.