Brigade Games is offering free US shipping on all orders over $50 until June 30th and a discount to international offers.
From their announcement:
In order to give everyone some deals right before we go away for a week to Historicon –
Free shipping until June 30th for all new USA orders over $50. No coupon needed for the Free shipping, just order enough in your cart and select the free shipping promo shipping option.
International customers get $5.00 off your $50 or more product order. International customers use coupon code: FIVEOFF