Amazon (Including Kindle Unlimited)
Worldwide:
Amazon
UK:
Queer Lit
Foyles
Portal Bookshop
Waterstones
Blackwell's
Browns Books
USA:
Bookshop.org
Barnes & Nobles
Main Street Books
Walmart
Canada:
Indigo
Australia:
Booktopia
New Zealand:
Mighty Ape
Netherlands:
Donner Books
Denmark:
Saxo
Czech Republic:
Megabooks CZ
India:
Flipkart