My 6 year old son has shown a ton of interest in gold prospecting lately. So I figured that I would build him a packable aluminum sluice box for Christmas. I have looked at several commercial built ones and have an idea on what I want to build, but I am not sure on where to find the rubber mat and miners moss. I checked at Alaska mining and diving today and they were sold out. Does anyone know where I might be able to find this stuff around the Palmer or Wasilla area? Or is there any other material that might work instead? I don't have much experience in prospecting, but I am trying to learn as much as I can because my son is so interested in this topic. If anyone would be willing to share any helpful advice, I would greatly appreciate it.