i think one of the reasons dr. wilsons test are expensive is that they dont just check for "high" or "low" copper, rather he has designed a highly specialized test that looks at three different copper related conditions - copper-toxic, copper-deficient or biounavailable copper. i personally don't know of anyone else who tests for those three things.
his concept of bio unavailable copper basically says that you do actually have plenty of copper in your body, but its bound up in tissues and therefore unable to be utilized. in this case, just taking more copper usually doesn't help.
my personal feeling is that if you have copper issue, his test might be worth the investment. an option is to get the test thru him, but find alternative supplement elsewhere that are less expensive.
i wonder also about doing something like growing your own high copper wheatgrass, which wouldn't be too hard. you would just add plenty of coppper to the growing medium. this would give you fully bio available copper, as it will be in a plant matrix.
anyway, just some thoughts.
another thing to consider is asking on the adrenal fatigue forum here. i do believe a couple on that forum have used dr. wilson's test, so perhaps they can give you direct feedback about whether or not its worth the price.