DriveThruComics.com for the most part let's you download and archive the comics rather than having them accessible solely through an app or Web site.
As far as I know, all of IDWs comics on comixology are available as DRM free cbzs. All the Transformers stuff I've bought from them is, anyway.
Don't waste your money on this. This is that crummy recolored version where Robotmaster has pink lips and all sort of other crap.
The exclusion of #3 and #9 (I understand why) is kind of a deal-killer, even if I were looking to get digital versions. I'll stick to my original copies.
3 and 9 have been excluded from every reprint by IDW. Thank goodness the guest appearances didn't extend past those issues, or we'd have modern reprints with lots of gaping holes in them.
Trying to recall what the issue with #9 was... Is that when Ratchet goes to the Savage Land??? IDW has seemed pretty cosey with Marvel (printing numerous "artist's editions" of their material and the crappy Avengers/TF crossover) you'd think they could work out a licensing deal to release those issues, in digital if not print... Where those ones omitted from the Titan TPBs as well?
#9 was Circuit Breaker. Marvel owns her. How can they leave in all the other issues she appears? Its not like she was a 1 issue character.
Just checked my digital version of Transformers Classics, the reprint version with Optimus Prime on the cover. My copy came from Humble Bundle. It lacks issue 3 tfwiki.net claims that the TPB version includes issues 3 and 9. I could swear that to be true... but my nephew has my copy right now.
Oh, like I said, I totally get why it has to be that way. It's still enough to keep me from going digital (or buying additional copies, although like I said, I already have originals), though.
That's issue #8, which introduced the Dinobots (at least, in present day). The only volume currently available through that link contains just issues 1-13 (3 and 9 excepted). Circuit Breaker's later appearances aren't in play yet, at least not by this particular offer.