Once you have purchased Units of Contraband, just hang on to it and hope to land on a SELL city.

The SELL cities offer different rates per unit to sell your Contraband. e.g. Empire City pays $50,000 per unit while Blunder Bay only pays $20,000 per unit.

You do not have to sell Contraband when you land on a SELL city and can hang on looking for a higher price.

Contraband can only be sold by the owner in a SELL city. It cannot be sold or traded to any other player.