I myself just recently purchase some screen on ebay, search kief screen, 100, 150 micron and up they have. Purchase a 8" round screen sifter at dollar store to pre screen. Also to build a frame for my screen i went to home depot, purchase aluminun frame for window, about $3.00, the kind you cut to size and then bought a bag of the rubber line twine that holds the screen into the frame, about $5.00. I built a 12" x 18" sift screen, 250 micron screen, also home depot sells glass, bought a 18"x24" glass pane, $6.00. All done and said, everything came to around $25.00 to maybe $30.00. It works! the rest you learn on you tube. 1st time , soft black hash for me. oh, 1 more thing at home depot, you need the corner pieces, 4 to a bag, $1.85, this puts your frame together, also used some duct tape for strenght.