Depends on WHICH model and condition.
100 or so
No way to value with just the serial number.
100-250 or so
50-250 usd
50-125 USD
20-200 USD or so
50-150
50-200 USD
Rossi M88: That may depend on when it was made. What is the serial number? That may help.
100-250 or so
100 USD or so