I don't think it's legal to self-publish fanfiction in order to sell it in online bookstores such as Lulu or Amazon etc.
This comic has not been published anywhere. I printed out a couple of copies using online printing services for fans who had asked for a hard copy. I am not going to sell them in any online store. If this is what you are after, services I have used for printing operate in US as well: https://mixam.com. They allow you to order as many copies as you like, without minimum, so they are good for this kind of limited print.
Or you can ask those guys about their experience: https://www.etsy.com/uk/listing/736930268/hardcover-book-foe-my-little-pony
Really wow you just saved me a lot of trouble I want to start a comic company with my friends and you just helped me find a company to print in my own country too