H-2B Visa program has the same list of eligible country list as H-2A program. 

Effective Jan. 18, 2011, DHS and Dept. of State published on Federal Register that the nationals from the following countries are eligible to participate in the H-2A and H-2B programs: Argentina, Australia, Barbados, Belize, Brazil, Bulgaria, Canada, Chile, Costa Rica, Croatia, Dominican Republic, Ecuador, El Salvador, Estonia, Ethiopia, Fiji, Guatemala, Honduras, Hungary, Ireland, Israel, Jamaica, Japan, Kiribati, Latvia, Lithuania, Macedonia, Mexico, Moldova, Nauru, The Netherlands, Nicaragua, New Zealand, Norway, Papua New Guinea, Peru, Philippines, Poland, Romania, Samoa, Serbia, Slovakia, Slovenia, Solomon Islands, South Africa, South Korea, Tonga, Turkey, Tuvalu, Ukraine, United Kingdom, Uruguay, and Vanuatu. Of these countries, the following were designated for the first time this year: Barbados, Estonia, Fiji, Hungary, Kiribati, Latvia, Macedonia, Nauru, Papua New Guinea, Samoa, Slovenia, Solomon Islands, Tonga, Tuvalu, and Vanuatu.