Hello.
The best thing you can do is pass the reparation under warranty.
If you can't, you should buy an external charger from eBay and charge the battery using it. Many people do it.
You could also get a powermat if they sell one in the future for the N900.
Hope it helped

EDIT: I just saw that you got it from newegg. If you got a warranty, good, but habitually you'll only get a 1 month warranty. Your broken usb port is also a motherboard problem and it needs to be changed too. This is nearly unrepairable, I think.
Stick to my first idea of buying an external charger.