Isolation Transformers

I'll start off by saying that I read as many posts in the archives as my eyes will allow.
Having dedicated lines is not an option so this is the next best thing. I've read enough not to exceed the transformer of more than 60% of its power output.
All I seem to find on google is Tripp Lite but not Xentch or Topaz. One site had Topaz units listed at over a grand.

Can someone please direct me to where I can buy either of these units at a reasonable price.

Cheers