Also, while checking CJ Box's books in the UK, I also found an omnibus of the first six Joe Pickett books available for £4.68 in the UK. So if you want/need most or all of these books, that's a pretty good price. OTOH, eReaderIQ indicates that this has been as low as £0.99 in the past few years, and as low as £1.89 in the past year. So if you are patient, you can probably do really well on this one, but £4.68 for six books is pretty darn good as it is.
Note that the name "Picket" is mispelled in the title of the omnibus...
Joe Picket 1-6 contains
Open Season,
Savage Run,
Winterkill,
Trophy Hunt,
Out of Range, and
In Plain Sight
Kindle UK:
https://www.amazon.co.uk/dp/B07MQ7CRJL
Kindle UK/Smile:
https://smile.amazon.co.uk/dp/B07MQ7CRJL