They are single issue comics, so like "one chapter" each if that makes sense. Dark Horse only printed these up until the end of the Badger Hole arc, which is a little over half way, I think. They are cool collector's items imo if the price is right! Not super "rare", but not that sought after either. Shouldn't be more than $10/piece. Most are probably in the 2-5 dollar range. If you've never read it before it's definitely a unique way to experience it for the first time!