People discuss general value all the time.
There is one on Reverb listed for $375. I see a brand new one on eBay for $349, shipped.
Your S-0 was replaced with the S-1 (both made in Mexico), and I bought my S-1 used (2016 model) in nearly mint condition for $250 a couple of months ago.
The S-0 had mixed reception (check out YouTube) whereas the S-1 is more favorably viewed...meaning that the used S-0 probably shouldn't be worth as much as the S-1. I would probably start at the $250 range and work down from there...
Ukuleles typically lose 25-30% of their value once they have been owned--$244 is at 70% of the value of a new one right now.
If this were a vintage Martin, or a more rare model (e.g. Model 2, etc.) this would be a different conversation.