You can get the DVDs for a very low price these days, and find a way to tether the tablet to a USB-type DVD drive or to a computer USB port. For example : X-Men: Volume One (Marvel DVD Comic Book Collection) (2009) List Price: $20.00 Price: $12.31
Just buy them. The industry really needs more people to buy comics. The digital downloads are killing the comic industry. (ok not really). Well you should use comixology (but it's not free). They do have everything though.