I have about $4500, give or take a few $$, in a 40 Columbia. It started out as a 46-48 complete core for $1250 in Texas. I had it shipped to Cliff Helling (I think he is in Minn?) That shipping was about $350 Then I shipped another ring and pinion and an axle bell to him, another $100 shipping bill. Cliff bullet proofed it along with a conversion from 46-48 to 1940, a complete rebuild/parts and reassembly, about $2400. Another $350 to ship it to me in New York. That was in 2009, today $5000 for a completely rebuilt, bullet proofed unit is not out of line. Earlier units, 34 and 35 36, can be a little more $$