Today only, Groupon offers a $30 Skinit Credit for $15. That's tied with our mention from two weeks ago as the best dollar-off discount we've seen all year from Skinit, which sells protective iPod, notebook, and phone skins. (For purchases just over $30, it's effectively 50% off, tying the best percent-off discount we've seen from Skinit.) Shipping is a flat $2.99. This offer is valid from October 3 until Mar 31, 2012.

Although it's sold via Groupon San Diego, it can be purchased and redeemed by anyone.