I am an avid book reader. I usually buy from Amazon/Kindle Unlimited but will buy from publisher sites if it is cheaper. Love KU, I have discovered many new authors that way and then go on to buy their books. BTW, have been reading your books since The Duality Paradigm.
Amazon and Kindle Unlimited. I try authors out with KU and if the book is a read again I buy from Amazon. I also use Book Funnel for books given away by the author. I have not tried publisher sites yet.
Amazon and iBooks
I buy on ARe as well as Amazon and publisher sites (pride publishing and Dreamspinner press)