I'm not certain anyone would agree with me...however i reckon that freezing your trim is a stupid thing to do. Not only does it weaken and fracture/shatter the trichomes causing them to be less potent, I see it as a pointless step in making hash. Basically the cheapest way you're going to find is getting a section of silk-screen. You can order them online. You need 20 microns. OR 120-150 threadcount. 120 being optimum, or as close to it as you can get. You can get them already streched into a wood frame, that makes it a mesh tray about 1" deep. When I'm manicuring, i generally use a cardboard box to catch the leaves. I leave those leaves/stems in the box, lid open and put it in my closet for a few days, then stir the leaves so the dry ones on top shift off and the damper ones below are exposed to air, so they can dry. The cardboard also helps pull the moisture out of the leaves. I am of the firm frame of mind that weed gets better with drying/curing, and so I let my trim dry and cure for 2 to 3 weeks. With that mesh screen setup, you can take a handfull of your trim at a time, be gentle, and shake it or push it back and forth across the screen. Don't forget to use a piece of glass, maybe a glass top table or a shelf from a hutch or something. This process will take a while - watch a movie, brush the leaves back and forth across the screen while doing so, changing them out every 20 minutes or so, for a fresh handfull of leaves (sidenote, you can also cover your screen frame with plastic wrap on the open side, kind of making it a 'box' and just shake it without worrying about losing the leaf out of the top, and into your trichome piles). The general yield to this method is about 10% of your total processed weight if your trim is good. So if you process 100 grams, you *MIGHT* get 10 grams of usable higher grade hash. You can also reprocess those leaves maybe 2 more times, and get a lower grade of hash, however this is subjective to the ammount of trichomes already processed off the leaves. Anyway the screen probably would only cost you $20 US, and hey, it's worth it...I got one, and it works like a champ. Looks like old blonde lebanese hash when I'm done with processing, nice goldeny yellow, eventually after being compacted and such, turns dark brown, with a golden middle when you break it open. Hope that whatever ya do, it turns out tasty and works well for ya...good luck