Groupees has a great visual novel bundle on sale right now. This bundle is called the Doujin VN Bundle #1 and will support the Shot@Life charity. For a $10 donation you get Go Go Nippon! ~My First Trip to Japan~, Nichole, Aselia the Eternal, (18+) Deus Machina Demonbane, (18+)Edelweiss, and (18+) Obscene Medical Records of a Married Nurse. That last one was pretty much a given as an H game right?
These will delivered to you as Steam Keys, JAST USA Keys, and MangaGamer Keys. The Demonbane purchase will even net you a digital artbook! While Demonbane is the only one of these Visual Novels I have played I can tell you that alone is worth the 10 bucks. You can check out bundle on Groupees website.