Arduino UNO R4 is new design development board,based on the 32-bit microprocessor offering more speed, memory, connectors and connectivity options than the version of earlier boards.
However,the development kits for Arduino Uno R4 wifi board is very shortage in the market,therefore,if you want to buy the Arduino starter kits based on Uno R4 control boards,you may interest to visit below design.

If you need a super kits version,here is another design for you refference below:

Where to buy with mass quantity?
Contact:sales@cmxelcs.com