Amazon has Hasbro Gaming Avalon Hill Diplomacy Board Game for $15.49 – $5.17 when you ‘clip’ the coupon on the product page = $10.32. Shipping is free w/ Amazon Prime or on $35+
Now $19.35 – $9.03 coupon = $10.32
Note: Coupons are usually one use per account and YMMV.