Steam - $2.99 GoG.com (Bundled with Duke II) - $5.99
Steam - $2.99 GoG.com (Bundled with Duke I) - $5.99
Steam - (Megaton Edition inc. Duke It Out In D.C., Nuclear Winter, Life's a Beach) - $9.99 GoG.com - (Atomic Edition) - $5.99
Steam - $5.99 GoG.com - $5.99