Here's one currently selling on eBay, but..........
<a href="http://cgi.ebay.com/HO-RIVAROSSI-4-8-8-4-UNION-PACIFIC-BIG-BOY-NIB_W0QQitemZ150353426911QQcmdZViewItemQQptZModel_RR_Trains?hash=item2301c339df&_trksid=p3286.c0.m14&_trkparms=65%3A12%7C66%3A2%7C39%3A1%7C72%3A1205%7C240%3A1318%7C301%3A1%7C293%3A1%7C294%3A50">http://cgi.ebay.com/HO-RI...3A1%7C293%3A1%7C294%3A50</a><br>.....but this is a newer version, and with a better running motor than the older AHM version.<br>I tried searching eBay for 'AHM Big Boy,' but came up empty handed. Maybe someone else will<br>chime in here. I'll keep checking some other sources.<br>
Here's a similar Balboa 4-8-2 on eBay
<br><a href="http://cgi.ebay.com/Santa-Fe-4-8-2-Mountain-locomotive_W0QQitemZ280360693177QQcmdZViewItemQQptZModel_RR_Trains?hash=item4146ccadb9&_trksid=p3286.c0.m14&_trkparms=65%3A12%7C66%3A2%7C39%3A1%7C72%3A1205%7C240%3A1318%7C301%3A1%7C293%3A1%7C294%3A50">http://cgi.ebay.com/Santa...3A1%7C293%3A1%7C294%3A50</a><br><br>You might want to see what this ATSF 'mountain' ends up selling for?<br>Although, yours might be an earlier, or later version?<br>Fab edit: I just realized the pilot has become unsoldered which will deduct from the actual<br>fair market value making yours worth more, but it's worth a look to see what the seller gets for it!<br>