Bob, I recently bought a whole late F front end, less wheel and rotors for 100 bucks. Serviceable core condition- The forks, calipers and master all needed to be rebuilt, and I decided to replace the lines as well.
If it's all in nice shape, it's probably worth double what I paid- if it's all in good serviceable condition, maybe a bit more. I see the fork lowers by themselves go for what I bought my whole front end for on ebay, but that seems unreasonable to me.
Make sure you replace those loose balls with some taper bearings while you've got the front end apart. Best thing I ever did to my bike.