Soooooo on a site called Ovipets (linked to Facebook) I've been making adoptables because I'm too lazy to turn eggs.
To get all the mutations the base has 101 layers...
If you play Ovipets here are the prices:
Species Available: Cattus, Lupus, Lotor
No mutations: 1 credit
1-3 mutations: 2 credits
4-6 mutations: 3 credits
7 + mutations: 4 credits
Tattoos: 1 + credits depending on complexity
Accessories: 1+ credits depending on complexity.