Dave's right, it's hard to give even a ballpark without a visual inspection. Try getting yourself a
Gun Trader Guide from a bookstore and maybe even Walmart would carry them. If you have an Ollies store near you check there. You can usually find last years edition for about $5 or so and values don't change much one year to the next.
This book will list the different variations of a model and also give you a couple values based on condition. Gun shows are another place to get an idea, but figure they run slightly high.