I've been looking around the web for the best price for a Panasonic 20mm f1.7. I came across DVStage.com, an impressive looking site which purports to offer the lens at £148 - £122 pounds less than the next lowest price! Thinking this is probably too good to be true, I googled them and found lots of reports about their shady dealings. Typical is: this one
Hope this is helpful!