I have several in ATSF - a mix of 2-rail and 3-rail. They occasionally pop up on that big auction site, but the sellers are asking premium prices, typically over $100 per car. If you need 3-rail and are only able to get one that's the 2-rail version, I can swap you the trucks and couplers for three-rail.
They look nice in a train with the MTH cars, which are also fetching a premium price now.
Save a search for "Atlas Berwick" on eBay. They pop up from time to time. I managed to find two ATSF and one rare-as-hens-teeth TTX this way.
If I sold models as sought after as Atlas O's Berwicks, Trinity hoppers, and intermodals, just to name a few, I'd be producing runs of them a bit more often. I know rarity keeps values high, but these pieces selling for 2-3 times msrp should be indication that the market exists for them, right?
Edit: should mention I'm not looking to sell at the moment (too few are and for good reason, these are fantastic pieces). I just wanted to share the strategy that worked for me.
I agree with Woody's approach with eBay. Patience is key. I snagged a couple off eBay that were listed at less than $90 whereas most of them are listed at $150+. You have to be vigilant though, because they go quickly.
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