There is plenty of land in zambia up for grabs. That is my country though I live in Canada now. I have managed to aquire 2000 Hectares of land in the Southern province.
As to which part of zambia is good for farming, I guess it entirely depends on what kind of farming your are engaged in.
Southern and Eastern provinces are by far the best places to invest in both crop and animal farming. Tobacco, maize, cotton, peanuts, Sunflower etc are grown in these parts of the country.
Just for your info, land is even cheaper to acquire through traditional authorities at cheaper prices and with no beaurocracy and normally such land comes with water rights and cocer periods of up to 200 years. reach me at
mweemba@gmail.com and I can maybe help.