As expected, the Apple Store made the second-generation iPad available for order shortly after 4 a.m. ET. Both the black and white models are available with WiFi in 16GB, 32GB and 64GB versions along with the 3G versions for AT&T and Verizon, but interestingly all models show 3-5 business day availability. Apple is also limiting orders to 2 per order, although it is unclear whether a customer can place more than one order to obtain more iPads (previously Apple canceled multiple orders that exceeded the two limit).