The Apple Online Store no longer offers the Wi-Fi only version of the original iPad in its clearance section and has run out of the first-generation 16GB Wi-Fi iPad in the refurbished section, as noted by MacNN.
All three of last year's 3G iPad models remain on sale in the clearance section, priced at $529, $629 and $729 for the 16GB, 32GB and 64GB models respectively. The refurbished versions of the 32GB and 64GB Wi-Fi iPads sell for $429 and $529, while refurbished iPad 3Gs sell for $479, $559 and $659.
Shortly after unveiling the iPad 2, Apple began offering remaining stock of the original iPad for a discount. Unopened models of the iPad are on sale for a $100 discount, while refurbished models sell for as much as $170 off the original price.