An even better place than
ebay is
www.bidstart.com .
Is much more specialized in stamps than
www.ebay.com/b/260/" rel="nofollow">ebay. They used to
be called stampwants.com, but branched out recently into
coins and other collectables. You can get a feel for real
world value by checking out sites like this for sold pieces.
Like mentioned, in no way, shape, or form is Mystic realistic.
They are way beyond even stealers, er, dealers, and catalog value.