I'll start, I have..

FOR TRADE
new york avenue (orange) x2
illinois avenue (red) x1
atlantic avenue (yellow) x2
north carolina avenue (green) x2
park avenue (blue) x1
reading railroad x1

I NEED
boardwalk (blue)
pennsylvania ave (green)
st james place (orange)
tennessee ave (orange)
virginia ave (pink)
ventor ave (yellow)
marvin gardens (yellow)
mediterranean ave (brown)
kentucky ave (red)
indiana ave (red)
pennsylvania, shortline and b.&o. railroads