I "solved" my broken USB port by buying a Nokia C3-00; a phone with the same battery (BL-5J) as the N900. Repair was not an option either form Nokia of third parties. My N900 have a new USB port, but it is not working. I was told the board has been damaged. Oh well ...

Interestingly, the C3-00 became my primary phone. Those Series 40 phone last forever and are cheap (>100 CAD). Not to mention the very cheap unlimited data plan that comes with feature phone in Canada (7-10$ / month). I can't believe I am going to say that but I felt in love with Series 40.