I have recently used Smashwords to publish a fundraising photographic ebook raising money for the Beating Bowel Cancer charity. The "Beating Bowel Cancer" fundraising book is half price on smashwords until June 23rd simply type in the coupon code VT46U at checkout
https://www.smashwords.com/books/view/542772
The coupon is only valid on smashwords, but the book is also available through all normal channels such as Amazon & ITunes.