Any SEM wagon kit or ready to run...so long as it's under the $20 mark as I want to 'build up' my rollingstock
Tarps for GY/I wagons, removeable plastic ones.....
I will sell you a GY kit unbuilt for $20 + postage.
But I would recommend going to your nearest hobby store, or even simply placing an order with SEM.
Unlike my price, they won't rip you off