I have a new (without box) Manfrotto MVH500A tripod head w/ 60mm half ball.
Asking $110 + S&H.
You can take off the ball & it is the same as the flat base MVH500AH, which is perfect for a slider or monopod, or whatever you need a very compact & light weight head.
$150 from B&H
http://www.bhphotovideo.com/c/product/944775-REG/manfrotto_mvh500a_pro_fluid_head.html
Asking $110 + S&H.
You can take off the ball & it is the same as the flat base MVH500AH, which is perfect for a slider or monopod, or whatever you need a very compact & light weight head.
$150 from B&H
http://www.bhphotovideo.com/c/product/944775-REG/manfrotto_mvh500a_pro_fluid_head.html