I believe that depending on how much sub-grade work and drainage work is needed etc., you can figure a budgetary number somewhere between $400,00-$700,000 depending on size of field and what type turf selected including installation. If you throw in nice stands/stadium, batting cages, bullpens, new lights, scoreboard you can easily get in the 1-1.5 million range pretty quickly. They are purported to be 10 years +- but that also depends on how much use there is by other sports/activities (soccer, lacrosse, drill team, marching band, tournaments, football practices...)