Add the following to the list of items.

Scooter.  Cost: $10.  A scooter may be used to allow a player to advance one square.

Homing beacon.  Cost: $20.  A homing beacon may be set at any time, and upon doing so, the number of the owner’s current square shall be appended to the name of the beacon.  A beacon, once set, cannot be set again.  After being set, the beacon may be used at any time to allow the owner to Jump to the square it was set at.

Pointed Stick.  Cost: $10.  A pointed stick may be used by a player on an Enemy player located at the same square.  The player using the pointed stick may transfer $20 from the Enemy player to eirself.  A player may not posses more than one pointed stick at a time.

I reckon that’s a decent start..  Remember that Items disappear when used.