Craftsman Lawn Mower - $100
Originally purchased for >$200, this is the Craftsman 21" 6.5 hp push mower and mulcher with rear bag, model 38851. It's about 3 years old and was only used for about a year. I haven't turned it on in about a year so it'll probably need a bit of priming to get started the first time.
The only problem with this mower is that the plastic handle you pull to start it broke (the cord is currently tied to sturdy stick, which seems to do the job). This should be an easy, cheap fix, for those who find the stick handle too rustic.