.177 borescope below $2000?

The cheap Teslong or generic endoscopes are pretty good when viewed on desktop monitor.

I'm wondering what you fellas have found on Amazon for best values. Where to go for a true straight 45-90* mirror view that might hopefully fit a .177

I saw a nice $139 one I thought would work but the OD of the camera is exactly .177.

So if nothing small enough for .177, best value for .20 or .22 on up?

I don't mind a handheld screen but I prefer a 21" monitor plug in Mac/iPhone compatible 
 
i've been looking at the Endosnake that is susposed to fit a 17 cal. No right angle mirror that small though. I tried to call them but no good. Email says they will respond but didn't. Order off Amazon and take your chances. I won't deal if I can't talk on the phone. Watch the demo vids. Didn't look too bad. Good to see how cleaning is going but can't view rt angle.