For the second time Hasbro and joined with Humble Bundle to create a DRM free Transformers comic collection to benefit the Hasbro Children's Fund. Available from now until Wednesday, March 11, 2015 at 11am Pacific you can get nearly the entire current run of Transformers/Transformers: Robots in Disguise #1-37 and Transformers: More Than Meets the Eye #1-34 assuming you decide to go at least $5 above the donation average. At a value of $155 you can't beat the deal. These purchases are not tied into Comixology or other online retailer.
If ordering I recommend creating a Humble Bundle account first and then log in before donating. That way it automatically ties your purchase to your account to re-download if need to in the future. After donating you will receive an email that directs you to the site to download the books in your preferred format. If interested in the .cbz format of the books, the readers I use is ComicGlass for iPad/iPhone, Cover for Windows 8 and Perfect Viewer for Android. If go with epub format, Play Books from Google will probably more that meet your needs in most cases and includes syncing across devices.
The press release is here. The donate for the Transformers Humble Bundle 2 click here.