It depends on who made it and what condition it is in.
If it's a Hi-Point carbine, they are on the lower-end for value and price even though they are known to be reliable. It might be worth $200 U.S. Dollars.
But a Beretta or Ruger .40 caliber carbine might be worth $500 or so.
DO NOT ATTEMPT TO DO THIS!!!!!!!!!!!!
100-300 USD
100-400
100-400 or so
50-500 usd
100-400 USD
100-400 USD
100-500 or so
About 40 USD
No such weapon made by S&W
About 30-40 USD
Depends on condition, accessories, etc.. Price range from 250-500