My friend Bill from Olathe,KS, took me to the ranch near little town Alma. It is around 100 ha (European measures) big ranch and owners drive you in a jeep among bisons ,where they tell you everything from biology to history of that endangered species. I don`t know how much costs that visit because my friend paid all the costs,but it is really something special and interesting. I reccomend ! When you will visit that ranch,you must visit Alma too. It is a really cude town !