Jim in N. Va
I have successfully sold a number of power tools through Craigslist. I first look at what others are asking on Craigslist, if I can find something similar, and what the tool has sold for on Ebay. If I cannot determine a going market price from those types of sources, as a very rough guide, I first figure out what is the current price of the same or equivalent tool and take 65% of that. I then adjust up if the tool is in exceptional condition or down if the current equivelent tool has new, enhanced features.
That said, on average I have gotten about 65% of current, new prices. My tools are always in great shape as they are well cared for. Maybe I could get more, but once I decide to sell something I generally just want it sold so I can have the space and the cash.
As to the going rate for 8 year old table saws, I just don't know. Some folks may be looking for the newer safety features (depressing demand for old saws) while others are dumping older saws and buying newer, safer saws (increasing supply). That, along with general economic conditions, could suggest the market is soft.
Still, you can always set a fairly high price. If it doesn't sell, all you have to do is reduce the price. Sort of like a Dutch auction. Finally, leave some room in your asking price to come down. Almost all buyers will ask if you will take less and having some wiggle room (say 10%) will help close by deal by helping them feel that they got a bargain.