S&W Model F .40 Parts needed

[tcaven]

Hey all, I'm looking to build another Model F from parts that came with my first one. The gunsmith said that the model is not made anymore but if I could find a frame and lower to go with the slide/barrel etc that i have I could have another gun for a decent price. Anyone know of a place to start looking for the parts? I tried GunBroker but came up short.
Thanks