I found this post, on How to Turn a Mason Jar into a Fermenting Crock, really useful! For about $50, vs. the Pickl-it 5 bundle at $126, you can make a relatively economical set of four wide mouth mason jars, the size of your choice.
I got the one quart wide mouth mason jars on sale locally for about $9 for 12 jars. The supplies suggested at the article, I got for $44 altogether. The assemblies and jars altogether cost around $48 for a set of four. Whereas, you have to pay $126 for a five pack of 1.5 and 2 liter jars and assemblies at Pickl-it. I personally prefer quart size jars. When they’re done fermenting, just pop on a regular lid and put in the fridge.
It took awhile to research the best prices.
Best thing is, I don’t have to buy expensive (yet beautiful) crocks.