Check the classifieds on different screenprinting forums. You might also google "used screenprinting equipment" as there are sites that deal exclusively in used equipment. And, call around to local suppliers to see if they've heard of any units for sale. If push comes to shove, you can make one using 48" unfiltered blacklights. I built one with 10 bulbs in it and a vacuum blanket out of pond liner for doing yard sign screens. Small shop vac for the cover. Worked very well.
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