Back to the Future Vol. 1: Untold Tales and Alternate Timelines for Kindle & comiXology: https://www.amazon.com/Back-Futur…ture+vol.1
Back to the Future Vol. 2: Continuum Conundrum for Kindle & comiXology: https://www.amazon.com/Back-Futur…ture+vol.2
These normally go for $11.99 a piece! I actually believe this might be a price mistake, as if you buy the same books directly from comixoloy.com they cost $4.99 each at 50% off, but through amazon (who own comixology) they are $0.99!
Note: This is for the digital comics only (not the physical books) and you must purchase through amazon kindle store, but they do indeed link with your comixology account if you have one. Also I have no clue if these stories are any good as I haven’t read them yet, but at $0.99 a piece I’m giving them a shot!