I ordered an invisibleSHIELD from zagg.com for my iPhone 3G today - and they gave me 2x discount codes for 20% off in their online store. I don't need them, so I'm posting them below. If they don't work (they are one use only) let me know and I'll post a comment saying they're gone.
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Oh, and with the 20% discount, free shipping to the UK and Europe, and the strength of the pound, I got it for around 50% of the purchase price at easyishop.