Purchasing off of Craigs List...

LCLaw3

So I'm debating purchasing some things off of craigslist, but I'm not sure if its really worth it.  Specifically, the swing that I registered for is $150 at Babies R Us, but going for $50 or less on Craigslist.  I'm not sure if I should just wait to see if someone buys it or if I should buy it now.  I'm obviously concerned about not getting everything I registered for, even though I kept my registry to a "need only" basis, but I'm also a FTM and worried about how sanitary it is and if I can wash it, etc.  I would really love any opinions on this.