I love the Field Agent Buy and Try shops. They are not going to pay a lot, I think the last one was $3, but they are quick and you get to try a product and give an opinion. It literally takes a few minutes and you're done. I wouldn't do one of those unless I was already in the store or there were several at a time, but it's a great "fill in" shop when you're already shopping. Between 2 apps and a traditional MS company, I made $27 in 20 minutes, including reporting.
I absolutely love iSecretShop whether it's the app or site because there's a bunch of companies in one spot and with little exception, the shops are easy. I can often pick one up on the way to work, one at lunch and one the way home, picking up an extra $15-35 plus meals for each on a day where I would be losing money by making/buying those meals.
Shopping the South Jersey Shore