Amazon have both on my Author Pages (a slightly different one for the UK and .com sites, with variations in the blog). The books are print on demand, so nobody carries stock unless small bookshops opt to stock them. I even take some - signed and dated, with bookmarks - to a local charity shop (I have a British Heart Foundation charity donor's card). They're usually gone within days.
I usually buy ten copies for myself, sell them personally with bookmarks and postcards a bit cheaper than the advertised cover price, signed and dated. Last year I spoke along with several other authors - historical fiction and fact by Helen Hollick, Marc Morris, Stewart Binns, James Aitcheson and Glynn Holloway - and signed copies at English Heritage's Battle Abbey site.
Some readers asked me to add 'Battle Abbey' to the signature and date. You can't do that with e-books. I offer a signed bookmark to those who buy copies through the links on my main - historical - website, Northworld Saga site to both Amazon and the book publisher.
You've got to give readers the option, but remind them of the advantages of buying the book. In this case each book has a map, historical background and notes with a pronunciation guide for mediaeval terminology and names. What more can an author offer for little return on the research and writing time? Don't get me wrong, I enjoy the writing etc. I shall be back at Battle Abbey this year with the other authors, I hope even to get to the Jorvik Viking Weekend at York next February through the Jorvik Viking Centre.