Seattle Coffee Gear has the Breville Precision Brewer (Brewer's Cup Tribute Edition) For $219.95. Includes the pour-over adapter. I believe this is the lowest price I've ever seen for the 455. I've owned this brewer for 9 months and absolutely love it.
New Seattle Coffee Gear e-mail subscribers can get a "10% off one item" coupon. Exclusions apply, so I'm not completely sure yet that it applies to Breville but in the past, it has.
Also available are the other models of the Breville Precision Brewer:
Breville Precision Brewer BDC450BSS Coffee Maker (thermal carafe) $199.95
Breville Precision Brewer BDC400BSS (glass carafe) $179.95