Cafe Press: This website allows you to create digital designs that can then be sold on the platform. You'll earn a commission for everything that sells and you'll never have to deal with logistics like printing, warehousing and customer service. If you have some graphic design skills, then this is a great potential source for your web-based income.
If you worry that your readers won’t like the fact that you’re making money, I encourage you to shift your paradigm on this a bit. If someone provided valuable information to you, wouldn’t it be nice to reward them a bit? Maybe they taught you something. Maybe they saved you time for not having to search for the information themselves. Maybe they showed you some great uses for a product you were considering buying anyway. Whatever the case, if you’re providing affiliate links in an ethical way, no one should fault you for it.