Unfortunately the glitch is still in place at Amazon rendering Three to Tango pretty unsearchable (not even all 4 author names on it) and also says “not available in US” – Berkley is working on their end to get Amazon to fix it so I hope it will be soon.
ETA: It’s finally up and ready to go – so if you so choose, it’s also available on the Kindle
HOWEVER – In the mean time you can still get Kindle compatible books via other online book retailers:
Books On Board
Barnes and Noble
The Nook versions can be read on other devices with free software downloads to your phone or other devices.