IDW is having a bit of a publisher sale on Comixology right now, with some initial titles for a couple of good lines available as part of the sale. It runs through tomorrow.
The first collected volumes of a few things like G.I. Joe’s newer run are available, but the real pick for me is either the first volume of TMNT classic or (especially) the first volume of Transformers: More than Meets the Eye, which I picked up a while back on a friend’s recommendation and have been enjoying quite a bit.
I’d encourage you to give it a look and see what you can find; the sale is almost 50% off in some cases.