You could check out the Arilux line of controllers. They’re just little ESP8266 boards ready for use with analog RGB LEDs. I’m helping writing new firmware for it so it uses MQTT instead of the default protocol. Here’s the project and here’s the thread on the forums. I got a kit with the controller + a 16.4ft LED strip + power supply for $40. It’s out of stock on Amazon now (here) but I’m sure you can find another one easily. Or just buy the board and the LED strip separately.
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