Well I would be surprised if they are still there. The MS 250 alone is worth at least double what the guy is asking for the 3 saws.
If you want to get into this stuff, there are some things you need to learn sooner rather than later.
Always try to meet in a safe location with cameras.
Always get a bill of sale with model and serial #'s
Be afraid of the stories you hear and the ones you want to believe. You are being deceived.
By this I mean someone is trying to sell you a new MS 660 for $250. He tells you a well rehearsed story about how he needed it for several of his properties. Saw is absolutely unused. And you want to believe everything, and you even want to believe why he will not make you a bill of sale and show identification. All really well thought out explanations and reasoning.
Develop strong honorable rules to operate by and use them even when you do not want to.