As to your specific question regarding the commemmorative model 26-1s
I don't know the current values. But I'd like to find one for a decent price
myself.
Here is arecent thread on one I just purchased. It is one of forty
from the over run batch.
According to the Jinks Special Products list that gun, SKU #100920, is a 26-4 and 802 were produced in 1988 and 1989. Serial number range is BBY00354 to BBY0434. This does not exactly agree with SCS&W but since I do not know the gun myself I cannot say for sure which is correct. I would tend to go with the Jinks which is a listing compiled by Roy in 1996 but I can't be sure.