I picked up some this week at Erie Sports store(@$7), Try dicks or gander too.(you may even find it at a hardware store mabe a water bed store) Most fly shops have it also. There both a uv and a regular cure. I like the regular as I feel it is more durable.
To repair a seam use masking tape to hold down the seam tape as it cures, make the tape flat as you can make it.
Good luck. If the waders are breathable use denatured alcohol sprayed from a spray bottle to illuminate pin holes. Then circle with a marker, to point out where the pin hole is after the alcohol evaporates off.