If you want to go high end you might try the Russ Andrews site in the UK. They've just made a replacement wall wart for Cambridge DAC Magic that's amazing.
http://www.russandrews.com/category.asp?lookup=1®ion=UK¤cy=GBP&customer_id=PAA0402047710917FQRUDXZKVLUJCODS&cat_id=PMAINPOWESUP
http://www.russandrews.com/category.asp?lookup=1®ion=UK¤cy=GBP&customer_id=PAA0402047710917FQRUDXZKVLUJCODS&cat_id=PMAINPOWESUP