Speaking of borescopes...
Even less than $80.
I got one of these a while ago.
Seen some similar and only a few bucks more on Amazon that have a cmbo full size/micro USB plug so you can use on laptop and/or phone.
I ended up getting an adapter for this to use on phone.

http://www.ebay.com/itm/262310448166...%3AMEBIDX%3AIT