Never send anyone who is supposedly going to buy your goods a 'shipping deposit'!
I had some foreign lady (judging by grammar) email me on a raft wanting to buy it for full price site unseen (first red flag, no rafter would ever do that!
), then had the nerve to request i send her something like $900 via paypal so someone could come by and 'get it shipped' (2nd red flag). After I offered to pay the 'shipping company" cash upon arrival (she declined of course) I called her out and she fought the fight for another email or two before I told her what she really was -- a lazy crappy low life criminal who if she put as much effort into a legit job as she does scamming people that she could probably make a living, and forwarded all emails to paypal in hopes they might actually be able to do something with them (fat chance). She stopped bothering me after that.
So just cuz you use pay pal doesn't mean they are legit. I can only imagine how much they are successful, so seller beware as well!
I can say I've bought and sold a few things through the MB classifieds and have not had one glitch, we usually come up with a common friend/reference by the time a transaction occurs. Hard to know who/what you're dealing with on craigslist.