Trident Case cuts 50% off a selection of Apple iPhone, iPod touch, and Android smartphone cases via coupon code "TRIDENTEERSUMMER50", as listed below. Even better, all orders receive free shipping. That's the best percent-off discount we've seen from this merchant (though we saw a 20% off sitewide coupon in April). Coupon expires July 4 at 9 pm ET. The case categories, with starting prices after the coupon:

• Aegis Case for Apple iPod touch for $12.47
• Cyclops Case for Apple iPhone 4 (pictured in Ballistic Green) for $14.97
• Cyclops Case for Samsung Vibrant for $14.97
• Aegis Case for T-Mobile myTouch 4g for $14.99
• Kraken Case for Apple iPhone 4 for $17.47
• Kraken Case for HTC Droid Incredible for $17.47
• Cyclops Case for HTC myTouch 4g for T-Mobile for $17.47
• Cyclops Case for Samsung Captivate for $17.47
• Cyclops Case for Samsung Continuum for $17.47