(S-90)
(a) It is preferable to have multiple BPA’s for similar items and to establish prices using reverse auctions between BPA holders. If quantities are too small and not conducive to using a reverse auction, then when practicable, contracting officers should establish pre-priced BPAs by negotiating firm unit prices for specific periods of time or by incorporating supplier’s price lists or catalogs in BPAs.
(b) Blanket purchase agreements should not be established for supplies or services for which unpriced purchase orders should be used (FAR 13.302-2).
[AFARS Revision #21, dated May 22, 2007]