I recently lucked out and got a whole set of Athearn BB B&O passenger car kits for $20! I’d been wanting a set of these for a while. They were so old they still had $3.50 hobby shop price tags on them.[:P]
Dans Trains on Ebay has whole lots of Athearn kits from time to time. I guess he buys out closed hobby shops and estate sale from time to time. They usually sell for a pretty high price.