I don't subscribe to any ebook services, but I just found out about
Texture yesterday, a magazine subscription service. They have a lot of magazines available, including the only magazine I currently subscribe to (People, it's a guilty pleasure). They are offering a three-month trial for $10 for the holidays.
I downloaded the app yesterday, as did my husband, and it's pretty good. It could use some more features, like user profiles so I don't have to see my husband's favorites list intermingled with mine.