Where To Buy
The EP121 has pretty much finished its retail run. There are still some places online that have stock. FNAC in Europe and Amazon in the U.S. show them as available from time to time.
Asus has introduced a business version of the EP121 and its model number is B121. The main difference is the inclusion of TPM support which is important for many enterprise customers.
Here is a link to the Asus promotional site: