More money:
Buy two dinosaurs and place them in an enclosure (one enclosure for each dinosaur). Go to the lab and cross them. Make this as cheap as possible. Store the egg in the cooler then sell it. You can get it for 2,000 and sell it for 4,001.
Cheap dinosaurs:
Buy a dinosaur and put it in a cage. Go to the lab and clone it. Return to the lab and cross them together for 2,000. You can cross it as many times as desired.