The PID, SSR, and thermocouple can be easily purchased online. If you have a real good refractory supplier in your area, you may be able to find some things locally, but expect to pay a good bit more.
The following links come from the site where I purchased my TC and they also have the PID similar to mine for a good price.
Here's pretty much what you need:
K-type high temp thermocouple
Good looking PID with programable ramp/soak
And they also have SSR's. You could go for a cheaper PID if necessary. My PID doesn't have ramp/soak programming, but has worked so far. Just have to set it manually.
Hope this helps.