SOME OF THESE SALES END TODAY SO PLEASE READ THE DATES.
Here is a list of authors that have books on sale TODAY provided by R.J. Scott:
http://rjscott.co.uk/boxing-day-sale-2018

Dreamspinner Press, Harmony Ink Press, and DSP Publications are still having their Holiday sale through December 28th.

JMS Books has a sale that ends TODAY on with 50% off ebooks and $8 paperbacks.

Enspire Publications has ebooks 25-50% off until December 30th. Click coupon box in cart at check-out or enter: HolidayMadness2018.

Extasy Books and Devine Destinies is having a sale until December 31st.
Anna Butler has put her Taking Shield series on sale for 25% off, on Smashwords only, until January First. The first book is free to suck you in.
Kris Ripper has put her Queers of La Vista series on sale for .99 each until New Years.
GAYS OF OUR LIVES: https://books2read.com/u/3kravg
THE BUTCH AND THE BEAUTIFUL: https://books2read.com/u/4Ey6xz
THE QUEER AND THE RESTLESS: https://books2read.com/u/b625kE
ONE LIFE TO LOSE: http://books2read.com/u/mVBorM
AS LA VISTA TURNS: https://books2read.com/u/mvKk5j
Mischief Corner Books has all holiday books published before this year on sale until December 31st.

Less Than Three Press has 20% off all books including on pre-orders and a contest that runs through December 31st.