I'd be interested in some HO, green, BN bulkhead cars for the right price, regardless of coupler and wheel type as long as they look similar to this: http://thumbs.ebaystatic.com/images/g/5lIAAOSwintXSZIj/s-l225.jpg 60' preferred but not required.
If you don't mind painting and decaling your own cars, you could hunt ebay for MDC/Roundhouse bulkhead flats and Herald King decals for an inexpensive solution. Or look for the Athearn RTR version.
The Athearn RTR bulkheads would be great, but they won't be ready until February. I haven't found any others except one priced at $54.99. (I don't think so.) In the meantime, I have a few items I would consider trading for BN bulkheads. I'm going to list them in another post.