Scam or ok?

[linkofra]

I have a buyer who wants multiple items, totaling about $150.  They are brand new to ebay, as of 2-5.  (I checked their id name).  They say they are in Florida.  No feedback.  I said, oh you are new to ebay, and they said, yes, they joined to find these specific items, which I happen to have.  In looking at the emails, their email sent to me has a .ca extension, which is Canada.  Then, they changed their ID today to a completely different name.  I am suspicious.  Should I be?