Octave Mandolins
Here is a guideline to give an idea of ballpark prices:

I start with a price of $3900.  Curly maple back and sides. Select Adirondack red spruce top
with tone-bar
or X-bracing. Compound radiused ebony fingerboard with 21 frets. Ebony headstock overlays, simple
inlay. Sunburst coloring.  3-ply ivoroid binding with black stripe in the center on the body, fingerboard
and peghead.  Spirit Varnish / French polish shellac finish. Nickel plated Allen TR-1 tailpiece. Ivoroid
tuner buttons and a soft case.  
Click on an image for a larger version.  
Some things that raise the price are:
Blond color, fancy custom inlay, side sound port, Virzi tone producer, James deluxe tailpiece and any
custom work that takes extra time, including design time.

Some things that lower the price are:
Plain maple back & sides, nitrocellulose lacquer finish, single color dark stain, single color plastic binding,
unbound fingerboard
, peghead or back.