I haven't seen the gold ones here in Podunk either.I use a grey on everything but jambs,and using it wet will let it cut quicker and finer.I thought the greys were equivolent to 600 but I never really paid attention.The only use for the white ones is if you have to scuff a high metalic decal to clear over and you think you might get crried away with a grey.Other than that they're OK for scrubbing ground in dirt out of your hands.