There are lots of online survey companies, but their payouts can be small and take a lot of time to accrue the amount of points needed to cash out.
In most large cities, there are research companies that run focus groups weekly.
How to find them? Google “Your city name focus group”.
In San Diego there are the following research companies:
Another way is to look on Craigslist. Go to Jobs and in the search field type “Focus Group”. Some smaller companies may post ads for focus groups. Recently I participated in a mock jury style focus group and was paid $90 for 5 hours of work. Yesterday I participated in a focus group relating to housewares and received $40 for just an hour! I found both on Craigslist.
Right now on Craigslist there are a couple great opportunities in the San Diego area.