for end user:
mid US$ XXX - low US$ XXXX range til end of 2007.
From there on it will go down in value and pretty worthless after 2009.
for resellers:
high US$ XX - low US$ XXX range til the end of 2007 and then decreasing.
If you want to sell, do so a.s.a.p. or develop it yourself without loosing time - just my2cents, Good Luck.