Octave Mandolins
The standard price for the octave mandolin (GBOM - Guitar Body Octave Mandolin) is $3900.

This includes...
highly figured maple back and sides. Adirondack red spruce or Sitka spruce top
with tone-bar or X-bracing.  Bound radiused ebony fingerboard with 21 frets. Ebony headstock
overlays, Ebony trussrodcover and Torch inlay. Sunburst coloring on top back and sides.  3-ply
ivoroid binding on the body, fingerboard and peghead.   Varnish then French polish shellac
finish. Nickel plated James tailpiece. Ivoroid tuner buttons and a soft case.  
Click on an image for a larger version.  
Some options that raise the price are:
Blond color, Pickgaurd, Floating Ebony tailpiece, fancy custom inlay, side sound port, Virzi tone producer
and any custom work that takes extra time, including design time.

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