eBay prices on Schrades have flattened a bit over the last couple of years, after spiking from the collector frenzy that started after the factory closed in 2004. Rare or unusual models still fetch a fair price most of the time; I think when I finally found a 9OT for my collection I had to pay over a hundred bucks. I have no idea what they've been selling for recently, but it's easy to find out using the Completed Items search.
You could always sell here at BladeForums, if you purchase a Gold membership.
eBay will get your item the most views and possibly a better price if multiple collectors bid against each other. Bladeforums will probably be less stressful and less time-consuming.
And of course the price you get will be determined primarily by the completeness and condition of the knife. An unused/mint example still new in the factory box will bring the highest price. If you lost the box or don't have the sheath, subtract at least 30%. If it's used, consider yourself lucky to get half price.
And naturally you'll need to provide high quality photos (close up and in focus) to attract the big bidders.
