Save the game, NU it, and give yourself some cash.
Money is offset 73 (49h).  Fill the three bytes with $FF, and 
you'll get about 16.7 Million.  
Or if you're REALLY greedy, go to byte 76 (4Ch), and change 
that one to 01h to 0Fh (0Fh will give you about 250,000,000).