You can get the gopro on ebay for about $140.
I have the cruise cam mount and the gopro. I also have a Sony DVD camcorder.
The camcorder takes much better video but you can mount the gopro just about anywhere with the suction cups or the x2 tape mounts. I've driven around Seoul over some pretty bad roads with the suction cup mount...hasn't fallen off yet. It holds on quite well to glass.
2015 F34 328iX GT Glacier Silver
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red