For free..you pay the shipping: BallBlazer boxes

I have 12 brand new Atari 5200 BallBlazer boxes, with
instructions..basically everything but the cartridge.   You pay the
shipping..US only on this, sorry.

Shipping is probably about $1.60 mailed in a Tyvek envelope...if you
really want it protected, I can send it in a priority USPS box.  That
would be around $4.00 though.
I will take Paypal..if you add .25 for the fee per box.