I have had some real bad experiences with cycle salvage yards, even if you pull the parts yourself. Most tend to value parts based upon the highest they've seen them sell for on eBay and I'd recommend trying out out the Buying and Selling forum before going to those rip-off artists. Some may be different but around here I plain don't trust them. Very few of these bikes therefore they want premium prices.
Be prepared to bargain if you go to a salvage yard, take some small bucks in your billfold and leave the rest in your car. Take a friend and if they're stubborn tell them you're going to try to borrow a few extra $$. Many will cave in if you can lay some cash on the table but not all will.
Cash speaks, and most have been sitting on these for some time. Condition is obviously unknown.