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The short answer is no unfortunately. You can really think of Tableau as just a query/rendering engine, and not a data source.
That said if you wanted to go down that road what you could do is write custom SQL to join the two tables together. Does each sale have an associated material cost? If so then it would be a simple join to bring in the material cost for each sale, otherwise you would have to do some custom SQL that may require some help from someone more familiar with SQL.