While most retailers will have the Wi-Fi only Motorola XOOM ready to go on March 27, Costco is taking pre-orders now and giving and expected ship date of April 1. So what exactly is the incentive in ordering from them considering you'll be waiting a few extra days to get one? Well, Costco will only charge you $589.99 and toss in a free gel skin case to go along with it. If you're not an impatient person -- that's one hell of a deal. You can place your pre-orders at the Costco website. [Costco via BGR]