Go to the TRU-Draft registry and they have the serial number list there.
I assume its complete, I know some of the published BG serial lists are not.
As far as what one is worth. Location and condition are considerations. Mom gave $500 for hers back in the "90s, in central NC. It Had front cultivator frames, but no plows. But today four good tires that look o.k. and hold air would be nearly $1000 regardless of which tractor is on them.