There are a lot of sales going on in July, and many of my titles have been available at discount, but those sales are almost over, so you're almost out of time.
All of the Nomadic Delirium e-books (which includes a lot that I've written and edited) are available for 25% off from Smashwords. Go to: https://www.smashwords.com/profile/view/nomadicdelirium
Nomadic Delirium also has all of the Ephemeris titles available for 30% off...many of these are ones that I've written. You can find them at: http://nomadicdeliriumpress.com/blog/shop
DriveThruRPG and DriveThruFiction have a Christmas in July sale, which includes a lot of my titles. You can find these at: http://rpg.drivethrustuff.com/browse.php?manufacturers_id=2805 or http://www.drivethrufiction.com/browse.php?manufacturers_id=2805
The Genre Mall also has e-books at 10% off, and several of those are mine as well. Go to: http://jalanerwine.com/thegenremall/shop/ and use coupon code "new" at checkout.
They all end on the 31st, so order now...and of course, order often!!!