Flagstones that look old?

I'm rebuilding an old flagstone walk, and need only a few pieces to replace broken ones, maybe 5 or 6 max. What's there now is a mix of gray, blue, red, and aqua, of the shiny texture. At first, was afraid the filler stones would look too new, but having trouble even finding retail places on Long Island. Got flagstones?

Mary Y. (Lynbrook)