I wish I found this site earlier. I would have posted a simlar one we recieved that looked virtually identical to a typical invoice... right down to an
"INV# 12312". It was for over $60 and DID include renewing the domain along with search service. My boss almost paid it and then checked with me. (The fact we register our domains for around $9/year was the main tipoff.)

The INV# btw, was ostensibly for "Invitation #"