Its in the manual - page 44 on the english version.

Good news is they use very standard 5050 LED strips. These refer to a specific size but are otherwise mostly generic. 5050s are preferred here since they have 3 chips per package so you can have all 3 colours in a chip.
You don't need/want the addressable flavour of them (WS something or another) - these are costlier, and not compatible , and waterproof versions are probably a little more than you need (tho a little nicer for straight lengths of lighting).You can typically buy a set of them off your preferred online vendor for not much money.
These are often sold with connectors, and a little remote/control unit (and you can get extra ones) and typically can be cut to length with solderable tabs every 3 LEDs, or get extentions. Just remember these things are not registered (typically its just a header) and need to be plugged in the right way. As of 2017, I'd suspect a 5m roll of the stuff would be under a tenner.