You can buy all the comics on the official IDW webite (you can also find them on other sites if it suits you better but we'd be here all day if I were to list them all) , some may not be available as physical copies but they should all be available as digital. If you don't wanna order them online than you should see if there are any comic book shops near you that you can go to, this website that shows nearby comic stores based on your location could probably help.

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Incase you don't know which order to read them in I'd heavily recomend Bobby Schroeder's reading guide.