There are a few institutes and schools in Israel that offer special courses in agriculture for international students, among them: GIMI - Galilee International Management Institute, TAITC - The Arava International Trainee Center, Golda Meir Training Center, The Center of International Agriculture Development Cooperation and more. Iv'e attached an article at the end of my message that provide more information about the different schools and prgrams you can choose from. Regarding the cost - each institute offer different courses and different costs so i advise you to contact those institutes to get more information about the cost of the different courses they can offer you.