The codes are on the book pages but I'll post them here as well:
Time Shifters FREE!
https://www.smashwords.com/books/view/471396
code SFREE
Children of the Morning half price
https://www.smashwords.com/books/view/483973
code SSW50
Continuum half price
https://www.smashwords.com/books/view/492423
code SSW50
Plausible Deniability half price
https://www.smashwords.com/books/view/547601
code SSW50
The Future Memory Man FREE!
https://www.smashwords.com/books/view/552007
code SFREE
Gravity Spike half price
https://www.smashwords.com/books/view/642086
code SSW50
Through July! Tell all your friends!