http://www.maine.gov/bgs/centralserv/surplus/public_sale_dates.htm
Next one is May 9th. In Augusta, usually 1st or 2nd Friday of the month, one a month. Also note they do Public Auctions, which is different from the sales and on a different day. Usually the larger items go up for auction, like the state police cruisers with 100,000mi on them, foreclosure items, property ceased by the state, DOT dump trucks, stuff like that.
If you are looking for computers items, get there early. There are enough people who know the value of the computer stuff they have and will snatch it up early.
They also have desks, file cabinets, really really disgusting office chairs, and other worthless garbage (floppy disk holders w00h00).
I think that Lou Mcnally guy from Made in Maine did part of a TV show on the Public Sales a couple years ago.