The E-class is traditionally a 4-door, but don't forget, 2-door coupés were also made (300CE). It was this body style (W124) that MB chopped the top off of to make the 300CE Cabriolet.
Currently MB offers the usual SL and SLK convertibles but also a CLK Cabrio. There are no E-Class convertibles currently being produced.
'93 500E black pearl/black leather; 89,000km
'93 500E bornit(blackberry)/black leather; 69,000km; european delivery
'88 560SL desert taupe/dark brown leather; 89,000km
'87 190E 2.3-16 black pearl/black leather; 55,000mi
'70 280SL white/red; 135,000mi (original)