Battletech - The Crescent Hawk's Inception

Free C-bills:
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While still training (before the training center is destroyed), you
will notice that you will receive money (allowance, paycheck,# bribe,
etc.) 15 C-bills at a time. Just select a spot in the training center
and wait for about an hour. You should have at least 500 C-bills. 
Note that this only works on some locations on the map. Each location
varies by version number, does not work when paused, and will not 
work after the training center is attacked.

Should you have problems finding that magical spot in the training 
center, there is another way to get lots of cash. First, after every
training mission, hang around until the money stops appearing. Then,
put it into the ComStar stocks of Defiance Industries, better known 
as DefHes. This stock will steadily increase as time passes. If you
are careful, you should be able to buy tech training in the MechitLube,
all the weapons courses in the Citadel, a flak suit and a mech weapon
of your choice. Then, leave whatever money you have in the stock. 

Should you make it to the Spaceport, hide behind the ComStar building
for a few hours, and presto, instant cash. It may take a little longer,
but it is well worth it. Try leaving the game running overnight
to get up to 1.4 Million C-Bills.