Here is another robot kit that comes with everything you need to build and program your own quadruped robot. The Freenove Quadruped Robot Kit can be controlled with your computer or Android device. It comes with acrylic/mechanical parts, ESP8266 WiFi module, and 12 x EMAX ES08AII servos.
The board has ports on the control board, so you can add your own sensors and modules. The control board is based on Arduino MEGA 2560.