I think I've found a solution for those who are unable to purchase the episode through Amazon.
iTunes has the episode available for 2.99 and it appears purchases from iTunes are available in a long list of countries:
iTunes is licensed for reproduction of noncopyrighted materials or materials the user is legally permitted to reproduce. Purchases from the iTunes Store are available only in Albania, Algeria, Angola, Anguilla, Antigua & Barbuda, Argentina, Armenia, Australia, Austria, Azerbaijan, The Bahamas, Bahrain, Barbados, Belarus, Belgium, Belize, Benin, Bermuda, Bhutan, Bolivia, Botswana, Brazil, British Virgin Islands, Brunei, Bulgaria, Burkina Faso, Cambodia, Canada, Cape Verde, Cayman Islands, Chad, Chile, China, Colombia, Costa Rica, Croatia, Cyprus, Czech Republic, Denmark, Dominica, Dominican Republic, Ecuador, Egypt, El Salvador, Estonia, Federated States of Micronesia, Fiji, Finland, France, Gambia, Germany, Ghana, Greece, Grenada, Guatemala, Guinea-Bissau, Guyana, Honduras, Hong Kong, Hungary, Iceland, India, Indonesia, Ireland, Israel, Italy, Jamaica, Japan, Jordan, Kazakhstan, Kenya, Kuwait, Kyrgyzstan, Laos, Latvia, Lebanon, Liberia, Lithuania, Luxembourg, Macau, Macedonia, Madagascar, Malawi, Malaysia, Mali, Malta, Mauritania, Mauritius, Mexico, Mongolia, Montserrat, Mozambique, Namibia, Nepal, Netherlands, New Zealand, Nicaragua, Niger, Nigeria, Norway, Oman, Pakistan, Palau, Panama, Papua New Guinea, Paraguay, Peru, Philippines, Poland, Portugal, Qatar, Republic of Congo, Republic of Moldova, Romania, Russia, São Tomé and Príncipe, Saudi Arabia, Senegal, Seychelles, Sierra Leone, Singapore, Slovakia, Slovenia, Solomon Islands, South Africa, South Korea, Spain, Sri Lanka, St. Kitts & Nevis, St. Lucia, St. Vincent & the Grenadines, Suriname, Swaziland, Sweden, Switzerland, Taiwan, Tajikistan, Tanzania, Thailand, Trinidad & Tobago, Tunisia, Turkey, Turkmenistan, Turks & Caicos, Uganda, Ukraine, United Arab Emirates, United Kingdom, United States, Uruguay, Uzbekistan, Venezuela, Vietnam, Yemen, and Zimbabwe. Some features, products, and content types are not available in all countries
http://www.apple.com/itunes/affiliates/download/?id=576182636
http://www.tvmuse.eu/tv-shows/Disappeared_27602/season_5/episode_13/
Hoping this will work for anyone unable to purchase through Amazon.
ETA: Scroll down from tvmuse to find the iTunes link near the bottom of the page.
I'm not sure I am explaining this correctly, as I don't use iTunes.