artificial crib containers
we looked at all kinds of buckets. Try landscape pots, usually free. Some guys dig a hole and bank pour without a bucket. We found that without a container of some type, they get chipped and make a mess before sinking.
I remeber first time I made stake bed/buckets. Not enough cement and all that wood floats like a bobber. Ended up busting off half of what I worked so hard to make just to get it to sink!
You can see we use larger sizes of draintile pipe. Hit up local plumbing/sewer water,septic guys. They all seem to have cutoffs they will give you.