I start at $75. That's for the acid-free archival mounting/matting of an 11x14. You can frame it any way you like, but it's not getting eaten up by some bull**** cheapo mount.
+ $35 if it's an Ilfochrome
or
+ However much I feel my time and expense in the darkroom is.
or
+ Printing cost if it's RA-4 or pigment (inkjet).
+ Whatever the shot is worth to me. Is it something I'd be happy to reprint for the rest of eternity, or is it something I'll only do a run of a few prints?