Where to buy repair manual for 83 300SD

I'm looking to buy a repair manual on CD for my 83 300SD but not sure where to get a good one. I looked on Ebay but the feedback scores for the sellers were not great. Anyone have a lead on a reputable seller?

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http://skinnerbox.steaky.org/123_DISK2/program/123-cd-index.html
This might help in the mean time...
try half.com

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Go to http://www.shareasale.com/r.cfm?B 736&U9847&MI27 and type 300SD and do a search. There is a Chilton guide that they have for sale. It's only $17.

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