Too bad. I think it’s just a “stupid” switch, nothing fancy.
I guess it’s important to find a switch with the right measurements that can be ordered to your country and the right tools to replace it. (Or in short a good phone shop!).
The site I linked to above is pretty close. I think you can use the measurements from there, double check with the board and try to buy a similar one online (it’s hard to buy this stuff online as single items).
So I think you will have to ask phone repair shops that have the right tools and know how to order stuff if they will do this job for. A few good ones were mentioned here, they replaced the usb connectors … just search for this topic here.
On the other hand you have to decide if it is really worth it. Maybe you can ask the support regarding warranty? Normally such a switch should be able to handle a lot of action …
Update: I just saw this post, someone got it working again by using contract cleaner spray. He also links to another post that explains that the Samsung Galaxy Note GT-N7000’s switch fits that is available on ebay and people made a movie about. 
Maybe also something you could try? I would try contacting FP first and contract cleaner spray later 
Good luck!.