Sign up with focus groups in your area. Studies that you are eligible to participate in pop up sporadically but pay quite well – often more than $50 for an hour of your time. You can also look for focus groups online but will have to sort through a lot of bogus “opportunities” and sites that ask you to pay up-front for the privilege of participating before you find anything worthwhile.
Websites like Survey Junkie will pay you a decent chunk of change for the low-maintenance, borderline mindless task of completing surveys. Companies want to understand consumers better, and one way they do that is by compensating survey-takers (a.k.a. you). Most surveys pay between $0.50 and $1.25, and many of them take less than 5 minutes to do. You can read our full Survey Junkie review for more info.