Amazon UK has a very good deal on the Casio G-7700-1ER Mens G-SHOCK Resin Digital Watch. Buying directly will cost around $67.
But to get an extra 20% off that price, simply sign up for the Amazon’s Clothing Store email subscription and as a first time subscriber they'll send you a promotional code which you can apply at checkout. This will give you the headline price of only $51 - shipped to your front door!
Note, the voucher applies up to 5 items.