Can a Creative Cloud membership be paid in a single lump sum (i.e. for a full year) or are automatic monthly payments the only option?
You can purchase 3-month and 1-month redemption cards from a store like Best Buy or online from a place like Amazon. The country list restriction still applies for the redemption cards as it would with a monthly paid subscription as per the Availability section of the FAQ here http://www.adobe.com/products/creativecloud/faq.html.
Europe, Middle East and Africa