Bike camera

[colin69]

I am seeking to buy a bike camera or two , one for the back and one for the front , just need advice from people who have them and what the costings are , i would like to fit one to the rear and possibly to the front unless a helmet cam is better , i don't have £100's but any recommendations would be greatly appreciated and where to buy ,also i would like them to be compatible to work on my I mac ,  thanks guys