You see the same message over and over, the darn things are so expensive.
It doesn't have to be pottery, as a matter of fact I think glass is a better product for this application. For the last couple of years I've been using a glass cylinder about 4" by 16" and it's been fantastic.
The crock itself isn't really the hard part, it's getting a good weight to hold things down whether you have a little or a lot in your container. Most crocks are tapered and something that fits well at the bottom is a sloppy fit near the top.
Tall and skinny makes for a consistent amount of liquid above the food for a perfect ferment every time. Clear means you can see whats going on at all times in the fermenter.
This particular one is a glass vase but I'm looking for a supplier of something a bit thicker and stronger. I used a disk cut from a plastic cutting board and a jar of
water for weight.
A plastic 2l ice cream tub does a fine job of an airlock - I haven't needed to skim anything off the surface since I started using this system.
http://i828.photobucket.com/albums/zz206/Indyyeti/GEDC1418_zpse2222c96.jpg
I'll let you guys in on a little secret - a much refined product will be for sale "soon" at a very reasonable price.
Watch for the Zeli Veda fermenter. You saw it here first!!