Bought this scope on Amazon for $50 USD. It arrived in 3 days from China and is it ever clear. Even has a focus on it. Total with shipping $77
This exceptionately clear and works on PC's and Android devices.
https://www.teslong.com/catalog-c/rifle-bore-scope
This is the info and reviews I gleened from this other forum.
http://forum.accurateshooter.com/thr...scope.3989042/