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This £12.99 ($20) gift is probably most suited for today's tech-savvy tween (I couldn't imagine many suits using this cover on the way to work) but it's a nice idea nonetheless. The retro controller clip-on case is compatible with iPhone models, including the iPhone 4.
Dimensions: 1.5 x 14.2 x 15 x 7cm
Source: I want one of those