I ordered some screens like RickCorey, and I like them. I don't have them in any nice tubes though, I just use them flat and gently shake the seeds/chaff. I also keep my eye out for colanders/strainers and especially tea strainers, mostly at the dollar store but also sale racks at grocery store, Target etc, I now have a really nice selection of mesh sizes. I even have one plastic thingy with about 1/8" round holes, designed as a kitchen sink drain sieve.
