I've also found that you can use the large clear containers you buy food items in at Sam's Club. Containers such as peanut butter and there are some large square containers. If your not looking for esthetics these make great s/h pots after you cut the tops off and drill drain holes. I also watch for the tall round clear acrylic canisters (sets and singles) at thrift stores and garage sales. Just take off the lids and hardware, drill holes and your set to grow.