hi,
you can spend a small fortune on cameras, I use a go pro for my motor cross riding , really good camera but not too cheap.
most of my photos on JCB construction thread are taken with my cell phone its an old Samsung s3, must have about 3 hours of video on it at the moment plus photos , also have this nifty little camera that I got off ebay for $15 and it comes with an 8 gig micro SD card. It comes with multiple different mounting brackets and stands, you can clip it to the seats in a semi and look out the window as your driving , really small and very cheap.
cheers andy