While searching for books on Kobo to use the 90% off coupons on, I stumbled on
Slow Horses by Mick Herron, which appears to be a Constable-published stand-alone thriller by an author who also has a mystery series published by Soho Constable.
This one is priced at $4.79 at Kobo vs. $9.99 at Amazon US and $13.75 at BN. Don't know if this is a sale, or pricing error, or ???, but it's enough of difference that I thought I'd post it - and try it myself too.
It's couponable also, although I didn't use one of the precious 90% or 75% ones...just one of the more common 30% ones.
I'm always nervous about giving links for fear of getting the dreaded slap-down from a moderator for inadvertently posting an affiliate link, but I got this link by typing in kobobooks.com by hand and then searching, so hopefully it's clean:
http://www.kobobooks.com/ebook/Slow-...TCIdZikzug&r=1
BTW, if you want the link to the 90% Kobo coupon thread, here it is:
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https://www.mobileread.com/forums/sho...d.php?t=175921)