Skip to main content

Sole source purchase

A sole source purchase is when a county buys from one vendor without competition because only that vendor can supply the item or service, for example a patented part or software upgrade from its maker.

State purchasing laws allow exceptions to bidding for items available from only one source. Counties usually must document why no other vendor can meet the need, and some publish a notice so other vendors can object.

For vendors

  • If you see a sole source notice for something you can supply, contact the purchasing office quickly with evidence. The county may then have to compete it.
  • If you are the only source, help the county document it properly (for example, a letter confirming exclusive distribution) to avoid delays.

Sole source is different from an emergency purchase, which is about timing rather than having only one supplier.

Last reviewed Oct 30, 2026. This is general information, not legal advice. Laws and thresholds change; check the current statute and the bid documents.