Want to Buy WTB: Mamiya-Sekor C Lens

I'm looking to buy a Mamiya-Sekor C 55mm f/2.8 lens for my Mamiya 645e. Let me know if anyone is willing to sell one off, in good, working condition, for a good price.

I have 150mm f/4 and 80mm f/2.8 lenses and am looking to complete a set with a 55mm f/2.8 lens. If there is a better lens than that, that you are willing to sell, please feel free to contact me.