Smugglers always pay 2x more than the server shop for your ingots and gems. Their den are located at spawn and you are going to need passes to have access to them.

Passes

To have access to the smugglers den you need a pass and you can buy them from Broker, that is located underneath E animal farm.

Hector Pass

Hector pass costs 333 scraps and there you can sell iron, gold and copper. You can also sell them in blocks.

To use the pass you just need to hold and right click it twice.

Shane Pass

Shane pass costs 666 scraps and there you can sell copper, diamond and gold. You can also sell them in blocks.

To use the pass you just need to hold and right click it twice.

Mia Pass

Mia pass costs 999 scraps and there you can sell iron, emerald and gold. You can also sell them in blocks.

To use the pass you just need to hold and right click it twice.