Slave to Sensation is (as everyone reading this probably already knows

) the first in Nalini Singh's Psy-Changeling series. It has dropped to $2.99 at Kindle and Kobo US. It has been on sale before at $1.99 a couple of times, but quite a while ago, and only very briefly. Also, this was included in the
Psy-Changeling eBook Collection that was on sale in the UK a couple of years ago, so if you travel, check carefully before you buy.
Kindle US:
https://www.amazon.com/dp/B0023EF9H0
Kobo US:
https://www.kobo.com/us/en/ebook/slave-to-sensation-1