I have identified an easy way to get any dinos, including not-yet-published creatures (don't do it though), and you can get them at lv40 immediately to save you the trouble of hatching 16 of them just to get 2 max level speciments. I've tried a similar method here, but it doesn't work. Anw, here's a tutorial, although a crude one, but since it's easy I hope this ís enough:
Step 1: Find a dino that you still have more room for, a.k.a u have less than 12. Click the plus -> find more, and in most cases there should be a deal where you can by a lv10 dino with Bucks. This is only available with species that are not exclusive, so pick some cheap species. Personally, I find Irritator to be the best, but it depends on your situations, find what works for u.
Step 2: Open GameGuardian and search "[Dino ID];[dino level]". For example, if the deal is a lv10 Irritator then I'll search "274868500;10". Then, type 274868500 (the dino ID) and refine.
Step 3: if you're lucky, there will only be 10-15 lines left. Click on each of them and click Go to. Test them one by one until you find the line that is the dino ID, and the line below is the dino level (which is "10").
Step 4: Change the level to 40 or something. Go back to the game, refresh that deal to see if the deal has changed. If it hasn't changed, that' not the right line, try again until you find the right line of code.
Step 5: once you found the right line, replace the dino ID with the ID of the animal you want. Then go to that dino's cage, or the profile in the Innovation Center (brownish building), click on Find, and there you will fine the dino that you wanted being sold .
Note: Once the species ID is changed, the deal will be moved to the new dino's interface, you will not find it in the original cheap dino's interface