Not exactly Manga related, but in the past two years I've made extensive use of my city's public library of ebooks, mainly to read the newest fantasy and sci-fi titles. However, recently I realized that it has a very big collection of (digital) comic books as well!
While there are some Mangas too, it's mainly western comics. It took some time getting used to the colouring, the larger page-sizes and the generally slightly different pacing and flow, when compared to Manga, but by now I'm throughly enjoying the experience. There is a whole world of comic books to discover! And while I'm not to much interested in classic super hero comics, I'll gladly wolf down an epic fantasy like Monstress (which you should totally check out) any day.