For gold there are BOUNTY and LOOT.(I'm not sure but together you will earn 3000 gold.)
As said by the above post, the two current codes (as of June 29th, 2012) there are only two codes to gain gold. The codes are "Bounty" and "Loot". "Bounty" gives you $2,000 in gold; "Loot" gives you $1,000 in gold. In total, you will get $3,000 in gold. If you want any other extra gold, you must wait for new codes to come, loot, or sell unwanted items with resell value on them.
--Pencil(T) 05:59, July 29, 2012 (UTC)