For those that have the "purple/orange" gloves (and they leak) I have them too. Just turn them inside out up to the seam part. Apply clear silicone glue over the entire "inside" seam. Let dry for 24hrs. They won't leak again. I had to do this on mine a couple of years ago; still no leaks.
As far as other types of gloves. There are thin gloves (clear plastic), that are about 30" long. I've used them several times when visiting the west coast. Not sure who makes these gloves, but they work great. Next time I'm talking with the sales rep. I'll ask where they get them. In the mean time, now that I have told you what to look for, maybe some will find a supply for you.
In fact, I think I saw them in my farm (cattle, sheep, pig) catalog. I have since thrown it away; when I get my next month's copy I'll take a look for them. The gloves I think are the one used to deliver calfs. Check with Agway in the mean time.