Haus Publishing tell me that the Kindle editions of my books are currently discounted for a limited time only (discount highlighted below).
Amazon discounts: 
History of the Silk Road (5% off)
Mannerheim (34% off)
Armchair Traveller’s History of Tokyo (45% off)
Mannerheim (34% off)
Armchair Traveller’s History of Tokyo (45% off)
Although the majority of e-book readers choose to use Amazon Kindle, some may prefer to read in protected PDF and EPUB format. These can be purchased via Chicago’s website at a 40% discount, using the promotional code HAUSEBOOK40.
Also, over the coming weeks, any Haus books are available at a 30% discount in the UK if you order directly from them, and they will donate 10% of whatever you pay to NHS charities. A collection of the 143 charities that support the NHS. More information here: https://www.nhscharitiestogether.co.uk/what-we-do/#charities-together and here:https://uk.virginmoneygiving.com/charity-web/charity/displayCharityCampaignPage.action?charityCampaignUrl=NHSCharitiesCOVID19
Postage and packaging is free of charge to UK residents. To order directly from Haus, one has to call their office 020 3637 9729 between 1pm and 4pm between Monday and Friday.
The Official Schoolgirl Milky Crisis Blog 
Sadly those discounts seem only to apply to the UK…
Really!? Even the ones from Chicago…? I shall add an “in the UK” to the post so people aren’t disappointed.
I didn’t check the ones from Chicago because I was looking for a Kindle edition.