I see someone ask this at least once a day in main chat... So here's some tips on how to get currency!

Exploring: turn junk into cash!

Sell skulls that you get in explore to the monkey business for some extra sb
Turn feathers into nesting material and sell at 50sb
Sell cave bundles, (10 large rocks + 10 large leaves) in TC for 2-4gb
Sell gems on branches for 50-100sb

Hunting and patrolling

Sell food on branches at 5-10sb per use
Sell 100 uses of food for 1-2gb in TC
Sell patrolling backgrounds and decor on branches (Look up how much they sell for, then sell for a few less sb than that)

Raffles!

**This method does require having some currency stored
Look for cheap and low gen mutie cubs in the trading center (primal, pf, and bobbed tail do not work as well as pies and other muts)
Raffle them with 10sb tickets, and pick the item tickets below as well:
Elephant skull, Lion Skull, Rib bone, Hippo skull: all sell for pretty good at monkey
Food and toy bundles: can resell food and craft nesting material
Large Leaves and rocks: resell
shiny rocks and rainbow rocks: can be crafted or sold
Broken drone, UAV, coconut: can be resold

Event stuff

Lots of event apps and backgrounds can be resold
People may need certain things for quests, which raises the price that they are able to be sold! (Gems in november, amusement, underbrush, fossils, etc!) keep a look out!

Good luck out there