Two New 20% Off Vouchers For Green Man Gaming have been released. They both expire on July 18th.
They won’t work on specially priced games but they will work on almost everything else including certain pre-orders.
Update: Sorry but I forgot my usual warning about UK sites. GMG is a UK based site so you might get charged a foreign transaction fee by your Credit card company if you’re in the US. To get around this you can pay with paypal or through paypal. Or you have to use a CC that doesn’t charge the fee.