Probably at least worth trying to replace the ignition switch. Can you hear the fuel pump run when the key goes to the "on" or "start" position? If so, it could be starter. If not, it might be ignition switch. Either way, I don't know of any mobile car mechanics. I had a mobile boat mechanic come out to help with my boat motor once years ago and he was great, but that's of no help to you...
Life can only be understood backwards; but it must be lived forwards.
- Soren Kierkegaard