Sources for Rust Free Cabs?

[72malibu]

Hi, I joined the forum a little while back. I'm starting to help my dad get his '75 Gentleman Jim back on the road before he can't enjoy it anymore. He's the second owner since '76.

Can anyone point me to a good source or sources of solid cabs? I'm considering a CL find but I think it's overpriced and it's a non-AC cab so it's not really even what I'm looking for. Solid ones seem to be hard to find but maybe I'm not looking in the right places. What is a reasonable price for nice cab? I would much rather spend more now and minimize any rust repair/body work later -- I know how that goes.

I'm on the east coast (MD). Thanks for any help.