300bo Handi Rifle is $219 somewhere out there. I know because I'm seriously thinking of ordering one tomorrow (probably not though). With a little digging there are youth stocks available. At the price maybe cut it down. Also you are already into the caliber.

And as I posted in the gun thread, the Handi are going away. This might be a added bonus down the road.

Sorry, no advice on the scope... But red dots are cool!