As you look it over, keep a running tally in your head (or a notepad) of what will need to be replaced. Seat, tires, missing parts, etc. This will gain you some negotiating power and keep you from overspending. You'd be surprised what you can spend getting a $300 "bargain" back into something of a complete machine.
As always, you could sink $1,000 into getting a 149 looking and running good. The thing is, $1,000 wouldn't even be enough for one of those lawn toys they sell at Lowe's Depot, and a 149 puts those to shame.
