I don't know if it has been covered as I am just now finding this thread. The biggest roadblock for me and Cryo-ing has been that the welding shops will ONLY put it in an APPROVED container, which means a DEWAR. Dewar's are expensive, I watched them on eBay for a month a few years ago and never found anything that would work for less than $400! Please, don't get me wrong here, I'm not saying they can't be bought for cheaper because I know they can be, if you're in the right place at the right time with the right amount of CASH! I could have bought a NICE one that would have worked, it was set-up to hold semen straws used for artificial insemination on Show Goats...yes, I said show goats, I did other things in my passed life, anyway, it would have worked, OK at best, the price was 225.00, which was the "Good Buddy Price", that was years before I was making knives. We were going to start buying semen and needed a place to store it. We ended up passing on that one, and never found one that we could afford. Keep an eye on eBay and probably Craig's List and for those that live in Texas, and other areas of the country that have a lot of livestock production, cows, goats sheep, etc., look into the AG sites where they will have a 'Classified' listing. Bigger producers will usually have several of them, more than 2 or 3 and will eventually either upgrade in size and sometimes downgrade in size as well and will want to sell their older one. Also, in places like Texas and Wisconsin where livestock breeding programs are huge, there may be AG Auctions where they will be retiring (preferably) and sell out everything.
BTW, if BOSS can't get the links posted, I would appreciate being added to the list for the Crying research info. I did get go back and read some of the posts, I'll send Ausbrooks a PM.
THANKS, Rex
BTW, when this subject was discussed before, it was pretty much short down almost before it got off the ground, I can't remember exactly why it went like that, maybe because there was no evidence that it was beneficial in high carbon steel...I think.