There are indeed quite a few ways. The most straightforward one is documented very well. You find it here.
It is a scenario based explanation of the httpget() variant already mentioned.
As RSS is a mostly standardized data structure it usually requires little effort to adapt the documentation to your needs. Most work usually goes into styling the content you "print" out in your content as it sometimes contains HTML elements that aren't compatible with email coding standards.
One thing to be aware of, however: the example code doesn't include images. You need to add some additional code to fetch those. This follows the same logic as the other elements, so it's usually easy to do.
Also, if your feed contains article elements with a varying number of images in a media element you need to handle this with some more logic. This is not a typical issue, however.
Hope this helps.