Buckets, quikcrete, and see if you can talk em out of a few pallets. Go to the garden center and ask, the ones they use on the lumber end are on credit and have to be returned to the manufacturer of whatever good was shipped in on them. The ones in the garden center that mulch, soil, etc comes on are not and they'll usually let you have a few. I make some cover out of PVC but only when I can get scrap for free, it's simply just too expensive to buy at the store. Also get a lid with your bucket, cut the bucket in half and you'll have 2 buckets. Tear the pallets apart, you can usually get 2-3 stake buckets with 6-8 slats each out of one pallet depending on the number of slats
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