Need advice Don or anyone with aig rifle knowledge

[Catfish]

There are several kids at our church that are interested in shooting and I was thinking of putting a range in my shed and getting them to shooting. I am thinking I`ll buy 3 air rifles and want something accurate and cheap with good sights. What would you recomand for rifles and where to get them. I would prefer a dealer in Ohio, but if I can save money will mail order.