Three Neal Asher books are on sale at Amazon.com for < $4.
But beware: I already had other e-versions of these from Amazon. I really like the fact that Amazon
usually stops me from buying something I already have. Perhaps it is due to a change in publisher?
Line War:
https://smile.amazon.com/dp/B07H47PVH7
Polity Agent:
https://smile.amazon.com/dp/B07H4657RF
Prador Moon:
https://smile.amazon.com/dp/B01HU42772