You have any local fishing holes besides the ponds you frequent? I would find a friend w/ a pond or public fishery that needs some of their LMB population culled. You will want to look the fish over pretty good and make sure they are healthy. Be careful handling them and move them in small groups to your pond. I would probably wait to the water cools down in the fall.
That should do the trick, or you can pay a small fortune for adult bass. I prefer the former, but that's just me. I put three adult bass in my pond this spring from a small lake 2 miles from my pond.
