Arduino BT (Bluetooth) Board Status

What is the status of the Arduino BT board? It's not listed on the Products webpage on this website. Also, when I do reach the page from a Google search, the page is listed as "This page is temporarily OFFLINE."

Has the Arduino BT board been removed from production, or simply never offered?

If the Arduino BT board is not available, what are my options for Bluetooth connectivity? Buy a Shield or plug-in module from a 3rd party manufacturer? If 3rd party is your recommendation, can you recommend a reliable and easy-to-use device for Android phone control?

Also, can you recommend an easy-to-use Android app for Bluetooth control?

Thanks for your help.