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We actually have a way to deal with sites that show vehicles even when the intended vehicle is not in inventory.  Scalability for this kind of tool is certainly not for the casual programmer.  You could not build this in-house.  The concept is simple, but the development is far more difficult than pulling a data feed from a ftp location.  Scalability challenges are just the tip of the iceberg.  But we jumped over all these hurdles long ago.  Google has certainly proven that web crawling/indexing software can be highly scalable.  We have no problems with scale.