maybe some of the decorative stuff (light weight/flimsy) like a screen for keeping pets from scratching a screendoor. they sell these at most hardware stores might be what your wanting?? untill he comments on this we will never know.
I saw a demo of the gold cube at a GPAA gold show and they recommended 1/16" classification or less. I have used a rain gutter and spray bar system with screen on top and let the small concentrates run down the gutter into a sluice while scraping the larger stuff off the side of the screen into a tub. Just make sure you aren't planning on running the slurry directly into the Gold Cube because it will be hard to adjust the water flow to allow it to work properly.