MacMall.com has the 1.6GHz MacBook Air (model no. MB003LL/A) for $1199.99, which is already the lowest price we could find on this Mac model brand new, and until 5/31/09 save $200 with this mail in rebate offer dropping the price down to $999.99.  That's the same price Apple charges for a refurbished model.  Shipping rates start at about $13 and vary by method of delivery.  Sales tax applies for residents of California, Tennessee and Wisconsin.

A variety of FREE software and hardware (after mail in rebates) offers are also available including Parallels Desktop 4.0, Toast 9 Basic, HP Photosmart color Inkjet printer, HP USB 2-button laser mouse, and Everki laptop case. 

Refurbished MacBook Airs are available at Apple's online store starting at $999 (for the above mentioned model) and go up to $2149 for the 1.86GHz model with 2GB of memory and 128GB SSD.