When selling your products online, you need to collect money from people and then provide them with the product. There are many ways to do this but the one I use the most is E-junkie.
I started using E-junkie for all my ebook sales. It makes the process of collecting money and sending out the ebook super easy and they automate the whole process for you.
They also integrate with PayPal, meaning all your funds are readily available and you don't have to wait for monthly payments.
We have since moved the majority of our product sales to E-junkie, including the cheat sheet rulers and other kitchen products. I'm in the process of building out the shopping cart, but for now using the "Buy Now" buttons has been more than enough for what we need.
For more featured setups, E-junkie does require some manual setup, compared to something like Shopify. But at $5 per month, it is very affordable and does everything we need to successfully sell products online.