Catalytic converters--is it worth selling them separately?

I'm selling my '97 Mercury Mountaineer to a salvage place, but several people said to take out the catalytic converters, since the stuff inside (platinum, etc.) is worth more than what the salvage place will pay. I knew a guy who bought and recycled the stuff inside them and there are plenty of places on the Internet, just not near me. Should I shop around for a place to sell them or just take the $200? If, so, where's the best place to do this? The car is a mess (outside for 2 yrs., not driven) and would cost way too much to fix.