WEll here is a site of a larger company that sells all types of the gloves your looking for. http://www.grainger.com/Grainger/searchresults.jsp
NOw as far as testing, im not going to say you dont need to test them as recommended BUT we all know how that goes if you take care of them but the bag for them and use them and put them away after such they will be fine. The test they do uses air to see for any pin holes in the gloves. If your wearing the leather glove over the top this shouldn't ever happen. They usually wear out if you bend them to put them away keep em flat, protect them and they will be fine for doing service changes. hope this is of help. I know we should always follow what is recommneded but sometimes for what your doing it would be overkill.
Best fo luck
If for some reason that link does not work go to : www.grainger.com
and search High voltage gloves
[This message has been edited by NJ Wireman (edited 12-07-2004).]