Here is another one on Amazon.

2kg load cell

It also comes with microcontroller , PCB, display, power supply, and more...
$16.99

https://www.amazon.com/dp/B00CNE6FF...t=&hvlocphy=9006270&hvtargid=pla-313478146471

 

wow $16.99 is really cheap. Throw away prices!

 

Alternatively, you could contruct a watt balance, but it is much harder on the mechanical side of things.