Rather than going through an affiliate bank, I'd look for individuals who create products that would be valuable to your community and partner with them directly. In the digital space, many affiliates offer 50%, so you'll earn a lot more. The products are also more likely to be relevant and high-quality, so your community actually appreciates you sharing them.

You might also consider reviewing products on your blog that are relevant for your readers. We do this on The Write Life, and it works well for us: http://thewritelife.com/resources/