I got a brand new Winsdor Leeds Sora for $285, which I use for my "run around" bike, by carefully watching EBay.
I knew the size frame I wanted, and it matched.
I also use it for a trainer in the winter, which you can see a little bit here in my workout room. I love the bike and use it almost as much as my Lemond. I keep it set for easy riding with toe clips, so I can just jump on.
I do believe it is under 25 lbs "naked."