i use a few 5 gal buckets and a 1or3 gal bucket within that 5 gal bucket. drip feeds from the res to the bucket, collects on the bottom of the 5 gal bucket and back to the res. very cheap and can grow 1 very large plant or a few smaller ones in a single bucket. i fill w lava rock.

you can also get mesh pots/lid for a 5gal bucket in place of the 1or3 gal bucket, again very cheap.