My kind of acquiring. But I do buy plants occasionally. I prefer starting cuttings or seeds, like to watch them grow and the challenge! I'll share anything I have as long as it's not my last one.
Oh, it's plastic like I use for row cover! Duh. I just couldn't get that saran wrap picture outta my head!
At market the vendors tie filled (sand or water) milk jugs to the frames to hold their tents down. I wonder if they couldn't do double duty for you, heat and weight? We had a hoop house (homemade) before GH and DH would zig zag rope back and forth and secure it down that way. Not pretty but it worked.