The Ophiuchi Hotline by John Varley - $1.99/€1.97
Seems to be available in the US and European stores sans the UK.
https://www.amazon.com/dp/B00AFXMAC8/
https://www.ebooks.com/en-no/book/1046150/
https://play.google.com/store/books/...d=KxuSpVIMSgsC
Zones of Thought (A Fire Upon the Deep, A Deepness in the Sky omnibus) by Vernor Vinge - £2.99/€3.52
Seems to be available in European stores (including the UK).
https://www.amazon.co.uk/dp/B0047CPB2Y/
https://www.ebooks.com/en-se/book/761768/
https://play.google.com/store/books/...d=gszb1Gm9SC8C.