Bluetooth Headsets

Hi there, not sure if this is the right group, but it is the closest I
could find.
I am trying to find a Bluetooth Headset (like the ones for cellphones)
that I can use with a non-bluetooth MP3 player.

I have found some regular Bluetooth Headphones that come with a
transmitter that plugs into the headphone port on the player. Are
there any cellphone style Headsets that come with such an accessory?
Is there something like this that could be bought seperately to allow
my MP3 player to talk to a cellphone Bluetooth Headset?

Hope that make sense
Thanks