Three books in the latter half of Lawrence Block's Bernie Rhodenbarr/Burglar series are on sale right now in the US for $1.99 each. There were/are also some omnibuses of Burglar books available in the UK for nice prices, so if you ever travel, check carefully before you buy these individual ones.
The Burglar in the Library, #8
Kindle US:
https://www.amazon.com/dp/B000SEI1FO
Kobo US:
https://www.kobo.com/us/en/ebook/the...in-the-library
The Burglar in the Rye, #9
Kindle US:
https://www.amazon.com/dp/B000UKOMW2
Kobo US:
https://www.kobo.com/us/en/ebook/the-burglar-in-the-rye
The Burglar on the Prowl, #10
Kindle US:
https://www.amazon.com/dp/B000UMN7DU
Kobo US:
https://www.kobo.com/us/en/ebook/the...r-on-the-prowl
And the omnibuses from the UK:
The Bernie Rhodenbarr Mysteries: Volume One (£1.99, a really good deal) contains the first five Burglar books:
https://www.amazon.co.uk/dp/B005HVR8AM
The Bernie Rhodenbarr Mysteries: Volume Two (£4.99, still a really good deal) contains the second five Burglar titles:
https://www.amazon.co.uk/dp/B00654KMGC/