Over the years, I have seen several used ones pass through local hobby shops fairly quickly at reasonable prices for painted O scale. If they didn't run, they would not be good "shelf queens" because they lack a lot of detail. I still have an A5 and a B6 in unpainted kit form, but the kits are more like the old "shake-the-box" kits that don't require a lot of assembly. Still, I need to find the energy to get them done some day.
Chuck