I mainly use cashback sites to make money.
Why don't you use this site as a starter - http://rapidcashback.co.uk
I have been paid over 6 times from that site.
Or you can always use this forum to make a couple of $ and don't forget the $15 posting competition.
If you're looking to earn $5 - $10 p/m then yes, cashback sites are the way for it.
But to get an actual steady income, you want to be earning more than that. Just play to your strengths, do what you do well and try to establish some sort of business out of it, if you are prepared to put the time in.