County and municipal agencies in Lake County, Illinois sell surplus through online auction sites like GovDeals and Public Surplus. BidProwl tracks all of them in one place: 115 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.
112 live auctions across Lake County right now.

Highland Park, IL · GovDeals
4d 10h left · 12 bids
$1,025

Libertyville, IL · GovDeals
5d 9h left · 6 bids
$1,326

Abbott Park, IL · GSA
3d 14h left · 3 bids
$625