Here are some tips on how to get some more SB or GB! I use all of these myself :)

1. ALWAYS have your lionesses hunting! I suggest having them hunt in the marshlands and watering hole, since they usually bring down bigger prey. Once you've got quite a lot of food, you can sell them for food uses. 100 food uses go for 1000 SB, or 1 GB. You can also sell other amounts of food uses for that same amount, if I'm not mistaken.

2. If you have any trades in the Trading Center, remember to bump them as often as possible. That way, people have a higher chance of seeing them.

3. If you have a king/queen with patches/piebald, claim NCLs and breed them! If they drop any muties, sell them for some SB or GB! It may take some time.

4. Sell your skulls to Monkey Business. Lion Skulls sell for quite a lot, but selling things you don't need and your rotting items can add up to quite a lot of SB.

5. Attack things in Explore! You get about 10+ SB each battle, and you get EXP too! It's a win-win, except it takes -10 energy... but it's okay.

7. If you're pretty confident about your king/queen's looks, advertise stud requests!

8. Buy things during events, and sell them later in the year. Some things go for a lot of GB and/or SB!

That's all I've got, but if I have any more, I'll add them. Good luck! :D