County and municipal agencies in St. Charles County, Missouri sell surplus through online auction sites like GovDeals and Public Surplus. BidProwl tracks all of them in one place: 259 live lots right now. Register on the platform hosting the lot you want; most items are local pickup only.
The usual mix is retired fleet vehicles and police cruisers, public works equipment, school district electronics and furniture, and unclaimed or seized property. Inventory refreshes daily as agencies list new surplus.