The following criteria shall govern in determining whether an item should be supplied through local purchase:

1. (a) Urgency of need requires local purchase to assure prompt delivery;
2. (b) The items are perishable or subject to rapid deterioration which will not permit delay incident to shipment from distant points;
3. (c) The local purchase is within applicable limitation established by the agency head; or
4. (d) Local purchase will produce the greatest economy to the Government.