2Ce sigs are more popular speakers and you can have luck of getting those from the estate sales for around $300...500. Harder to get 3a's, but the link provided by kota1 shows non-sig model and they've been listed for nearly half-year at bellow $1k so offering around $750...850 for'm will probably get you settled and after that you can get Sig mod kit to upgrade x-over.
I hit estate sales more than once on both of these models, but since I'm not real fan of those Vandys I only purchased those to flip.