Hi Oli, I think with Amazon you just have to pick products that have quite a high price from the start. Me with my beach decor site, most home decor items are fairly cheap to buy, so the commission is not that great. You either have to sell heaps of cheaper products (which is very hard) or some expensive products (which I am not sure will be easy, either).
For example, the content on Super Weddings is useful whether you're organizing a wedding today or next year. All the content on the site is created accordingly. To make things easier for the audience, it is separated into categories to make it very convenient for the reader to find what they're looking for. This, of course, is also very good for SEO. 

Seb, ebay is definitely worth a look. I am also with ShareASale which has lots of programs with a good commission. This has earned me around $74 last month, and already $10 for this month. An Affiliate Program that has also proven well for me (this one depends on what you are trying to sell though) is Art.com. It has been making me a steady commission since I have joined, on average close to $40 a month. They offer 20% commission on every sale! See whether you can do anything with them…
The affiliate marketing industry is growing steadily. An independent survey commissioned by Rakuten Affiliate Network found that affiliate marketing is set to reach $6.8 billion by 2020. Ninety percent of advertisers included in the survey said that affiliate programs were important or very important to their overall marketing strategy, with the majority of publishers reporting that affiliate partnerships drove more than 20% of annual revenue.
I absolutely LOVE affiliate marketing. Affiliate marketing can feel quite passive and it makes location independence and traveling full-time much more enjoyable. You can create just one blog post or social media post, and potentially earn money from it years down the line, as long as you maintain it and keep generating traffic to it. With affiliate marketing, I can enjoy life more and know that I am still able to earn a great living promoting products that I use and enjoy.
Sign up, the process is pretty straight forward. If you live in the US you can apply to the Amazon affiliate program, unless you are a resident of Arkansas, California, Connecticut, Illinois, North Carolina or Rhode Island. Sorry if you are in one of these states, due to tax laws they have been “banned” from the program. If you happen to live in one of these states, don’t worry there are other programs that you can promote Wal-Mart is just one example. Click here to get general affiliate marketing training. 
Always disclose your affiliate relationship. Most visitors will probably understand that graphic ad will lead to your getting paid, but if you write a review or use an in-text link as a recommendation, you want your readers to know that may lead to compensation as well. This ensures you retain transparency and trust with your readers, but also, it's required by the FTC's endorsement rules.
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