Anyone knows where i can get a Double DIN BMW E46 DVD Player with GPS Navigation for 3 Series In Birmingham?

I will be visiting Birmingham for a few days and i was wondering if i can find there (or even in London) somewhere where i can buy a Double DIN BMW E46 DVD Player with GPS Navigation for BMW 3 Series ... i want to replace my original CD player with a Sat Nav for my E46 ... any ideas?