Buy Properties at Reduced Prices
To buy any lot, utility, or railroad at a reduced price, first
land on any unowned property, but bid instead of buy. Make your
bid and hold down the Up or Down arrow( depending on if you are
the first player or last player on the "bidding list").
The screen will say Going, Going, Going... ... and will say "Sold!"
You can use this trick anytime you land on an unowned property.