Depends on condition. Range from 50-150 USD.
Replaced by other models.
call Taurus.
$600
Any one that fits a S&W K frame
About $500
The model 26 was in .45 acp, NOT .357. They were made from 1950 until 1966. So, to answer your question, there is no value in something that doesn't exist (a S&W 357 Model 26).
You will have to call S&W.
50-550 usd
50-500
No such model in the S&W line
50-500 usd
You need to call S&W to verify that it left as a 357. The Model 68 was chambered in 38 special