Black market

The black market was a GLA structure which served as an upgrade center and an alternate source of income.

Background
By trading items that are illegal or unclassified (contraband, "rigged" stuff, or UN humanitarian supplies) under international law on the black market, GLA generals could obtain important upgrades and a steady cash flow. The GLA focused all of their "liberation trade" here to easily conceal such transactions from unwanted attention.

Black markets are only the location where transactions take place and do not store funds or merchandise on-site, therefore, they are immune to supply center hack. The black market may change hands as a result of direct capturing, however. Their "administrator" is a crafty and flexible individual though, always giving a steady income of $20 worth of supply periodically, regardless of their actual profit or to whom they pledge their allegiance.