bh320d

Hi can someone please tell me if it is possible to have a usb socket added to my 2008 320d it has the single cd slot head unit with satnav disk inside buissness class i believe it has a aux port in the glove box, but i have seen on ebay aux/usb units, the car is pre lc i believe after doing lots of research, all i qant it for is to load my Music onto a usb stick then control it via the head unit, i know i can just connect my phone to the aux socket and play Music that way, ive been quoted by a guy £350 to upgrade it but was hoping for a cheaper option

Hi just found the page, recently brought a 2008 320d msport buissness class and loving it, no doubt i will have loads of questions.