There are many police auctions that are advertised but I've only found one that covers US auctions and isn't UK based. These include seized cars, seized boats, electronics and lots of daily items you can get at a fraction of the cost. Here's a recent news sampling:
GSA Vehicle Auction
There will be a GSA Vehicle Auction on November 1, 2006 at 10 a.m. This auction will offer vehicles in different years, makes, and models. Some of the vehicles scheduled include a 1999 Dodge Ram and a 2001 Ford F350. Click here for More Info
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DNR State Land Auction
Coming up on November 2, 2006 at 11 a.m. there will be a DNR State Land Auction. This auction will offer 2-parcels of land. This is the last in a 4-auction series to auction off 23-parcels of land. Click here for More Info
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IRS Seized Wine Auction
Coming up on November 7, 2006 at 2 p.m. there will be an IRS Seized Wine Auction. This auction will offer for More Info approximately 46-cases of wine and spirits. A complete and detailed inventory list is currently available online. Click here