If you run a personal finance blog or that sort of website then there are lots of survey sites you can promote in return for commission.
VoxPopMe is a free mobile app for Android and Apple that you can use to earn a bit of extra money.View Listing
Clickworker is a crowd-working website where you can earn money by doing quick and easy small tasks.View Listing
Clixsense is an online rewards website. It was first founded in 2007 so it’s been around a long time!View Listing
They have a wide range of retailers and service providers that you can promote. Including some premium brands. See details and reviews now.View Listing