Brought one of these from Everbuying (might be cheaper elsewhere not looked)
http://www.everbuying.net/product1166384.html
Proving very useful for inspecting workmanship on site.
Pros:
cheap (£10 and free shipping (2-3 weeks))
works with my Nexus5 Android phone via the related App
has built in switchable LED lights
good pictures
long lead
comes with some extra bits and bobs (not yet used)
IP67 waterproof
Cons
the clever built in USB and micro USB adapter is heavy - meaning it slips out of the Nexus socket easily (hence I use a little micro to USB female adapter)
each picture has a small watermark saying 'camerafi.com on it
640 x 480 might not be best available - but fine for me
on the move you need to hold the usb connection in the phone with one hand (as the weight of 5m cable pulls it out) while directing camera with other hand
FYI no connection with Everbuying or the supplier