There are a few (very few) SSDs out there for the Revision A Air. Runcore still sells theirs, but they're awfully pricey. A little googling reveals a few other manufacturers claiming to have some. If they seem too shady/expensive for you, there's always eBay. New drives for the Revision A are rather rare because it's the only Air that used PATA drives, and the later revisions had the benefits of lower pricing and better performance, so they sold much better. Best of luck though!