Motorola announced the March 27th launch of its Wi-Fi-only XOOM on Wednesday, and now Costco has made the tablet available for pre-order. While Costco quotes a ship date five days later than Motorola’s — April 1st as opposed to March 27th — the wait will award buyers free shipping, a discounted price and a free gel case. Granted, the discount is only $10, but tack on the free shipping and that snazzy gel case, and you’ve got yourself a solid deal. We reviewed the Motorola XOOM in February and said it packs a serious punch. Included with that punch is Google’s Android 3.0 Gingerbread OS, a dual-core 1GHz processor, 32GB of storage and a 10.1-inch HD display.