Grumpy_Mike:
I know this might come as a shock to some in the USA but other places exist.However you can get all the types in the USA.
Overview | RGB LED Strips | Adafruit Learning System
Note how the pictures show the same colour on all the LEDs on the reel.Adafruit NeoPixel Digital RGB LED Strip - White 60 LED [WHITE] : ID 1138 : $99.80 : Adafruit Industries, Unique & fun DIY electronics and kits
Note how their are different colours on the same reel.Overview | Adafruit DotStar LEDs | Adafruit Learning System
Note how their are four connectors, power, data and clock.http://led-tronix.com/product/addressable-lpd6803-30leds-5050-led-pixel-strip-lights-12v-dc-waterproof-ip67/
Note how it says "one pixel IC control three 5050 RGB"
I know fully well other places aka countries do exist.
I was not born in the USA. But since I reside here now, I don't go buying things from eBay in the Netherlands.
Other than the Dotstar which I don't know about because Adafruit products are expensive and I don't buy from their website, it looks like the products are deprecated.
I remember reading a website a few years back, and the one mentioned at the time were those
WS2812B.