Bluetooth for Desktops

I've been looking all over the internet for someway to put bluetooth into a desktop. I'm planning on building a desktop and I really want to have internal bluetooth, but I can't figure out how to do it. Does it come as part of the wireless card? I would really like to avoid a dongle or an external reciever, in my opinion that really defeats the points of having bluetooth in the first place. I'll buy one if I have to, but again, if there is an internal bluetooth card for desktops please send me a link to where I can buy one.