We designed a 4 foot by 8 foot by 14 inch grow bed for aquaponics and hydroponics as we could not find any anywhere here in the USA. They ship from Boise, Idaho. They are 1/4 inch thick polyethylene (same basic plastic as milk jugs are made of - no BPA) and weigh 78 lbs each. Smooth inside. They are actually just over 4 ft x 8 ft inside so when doing a raft system you are not wasting the raft material. Ideal for both DWC raft systems as well as hard media - flood and drain systems. They are $300 each in quantities of 1 - 3 and $280 each for 4 or more. Go to TankSeller.com for more information and to order.
Yes, they also work great for garden growbeds as they are UV stable and rated food safe by the USDA.