The Retina iPad mini is now available for order via Apple's online store. Delivery is currently 1-3 days for 16GB and 32GB Wi-Fi, and 5-10 days for all other Wi-Fi and Wi-Fi + Cellular models. It's available in a in many countries, including the U.S., Canada, Australia, and the U.K.
If you place your order, let me know what you get, and when the estimated delivery date is. If you're still trying to decide between an iPad Air and the Retina iPad mini, or between the various different Retina iPad mini options, check out our comprehensive iPad buyers guide: