Save your money really hard, and make sure you get enough firepower to steal the motorbike.
Don't forget to rob the car dealer.
Hopefully that will help you, but yes getting the limo is very hard.
You can only rob the car dealer when he makes you an offer for the crappy car.
Also, due to random variables, you have to be very lucky to get the limo.
Very lucky. I made the game and I've only gotten it once.
