Isaac Asimov’s short story collection, I, Robot, is $2.99 in the US right now, as part of Kindle’s current “Popular fiction titles for $3.99 or less” sale, good through 8/14, and price-matched at Kobo. Just a classic – if you haven’t read it, read it!
Asimov’s The Stars, Like Dust, is $1.99 right now in the US.
Kindle US: https://www.amazon.com/dp/B08GJZSFP6
Kobo US: https://www.kobo.com/us/en/ebook/the-stars-like-dust-5
The second book in Asimov’s Foundation series, Foundation and Empire, is £0.99 at Kindle UK right now: https://www.amazon.co.uk/dp/B07B64BHFS
The Gods Themselves is $1.99 in the US right now.
Kindle US: https://www.amazon.com/dp/B004JHYRP4
Kobo US: https://www.kobo.com/us/en/ebook/the-gods-themselves
The first book in Asimov’s Foundation series, titled simply, Foundation, is $2.99 in the US right now.
Kindle US: https://www.amazon.com/dp/B000FC1PWA
Kobo US: https://www.kobo.com/us/en/ebook/foundation-5
Second Foundation is the third book, not the second (!!!), in Asimov’s Foundation series, and the completion of the original story arc. (And, I’m not wild about the other titles, so for me, it’s the completion of the series…) Second Foundation is on sale right now for £0.99 at Kindle UK: https://www.amazon.co.uk/dp/B07B5X9WTZ
Two of Asmiov’s three Robots books are on sale at Kindle US for $3.99 each right now. Not great sale prices, but these only very rarely go on sale at all, so I thought they were worth posting. The Robots series are mysteries (even if set far from Earth) and feature Earth Detective Elijah Bailey and his Spacer positronic partner, R. Daneel Olivaw.
The Caves of Steel, #1: https://www.amazon.com/dp/B004JHYRAO
The Robots of Dawn, #3: https://www.amazon.com/dp/B0024NP57Y
And now the second Robots book, The Naked Sun, is on sale for $1.99 in the US…
Kindle US: https://www.amazon.com/dp/B004JHYRDQ
Kobo US: https://www.kobo.com/us/en/ebook/the-naked-sun
The Stars, Like Dust, is $1.99 again right now in the US.
Kindle US: https://www.amazon.com/dp/B08GJZSFP6
Kobo US: https://www.kobo.com/us/en/ebook/the-stars-like-dust-5
I, Robot is $1.99 again in the US right now. The links in the OP are still good…
The Gods Themselves is $1.99 again in the US right now.
Kindle US: https://www.amazon.com/dp/B004JHYRP4
Kobo US: https://www.kobo.com/us/en/ebook/the-gods-themselves