A new tripod head at double the price!!!

I just bought a nice little tripod ballhead as I felt my 3-way head was too heavy. This new one that I bought 2nd-hand weighs in nicely at just over 300g and can support up to 5kg. Seems a good deal at $100 until I saw another guy selling the same thing for $50 at Clubsnap ... Damn it ... I was watching the ads there for over two weeks but only until I made my move did all these offers came up! What a headache ...