Round natural rock (Mississaga St. W., Orillia)

I need a natural stone round or as possible rock about 12 inches across for the dragonfly's head in my rock garden you see in the picture. (or a rounded glob of cement will suffice)I don't drive so your home must be close to a bus stop in Orillia for this 75 year old to get there and if it is not too heavy to haul it home in my shopping cart.