For the record, here are the ones you WONT find:
Mediterranean Avenue ($50 prize, 2000 available, one in 1,057,000)
Short Line Railroad ($500 prize, 750 available, one in 21,956,000)
Vermont Avenue ($1,000 prize, 125 available, one in 64,603,000)
Virginia Avenue ($2,000 prize, 75 available, one in 34,165,000)
Tennessee Avenue ($5,000 prize, 10 available, one in 256,235,000)
Kentucky Avenue ($10,000 prize, 6 available, one in 427,058,000)
Ventnor Avenue ($25,000 prize, 8 available, one in 320,293,000)
Pennsylvania Avenue ($50,000 prize, 4 available, one in 640,586,000)
Boardwalk ($1 million dollar prize, 1 available, one in 542,034,000)
If you find any of these, (except the $50 one) I'd farm McD's until you get the other two, as you should be able to fill out the missing peices fairly quickly.