The truth about who "makes" DEF.
DEF certified manufactures.
Peak and Kleen are made by Old World Industries. I use Kleen DEF from Menards ($8.88 per 2.5 gallon) since it is about $7 cheaper per jug than the overpriced "Peak" brand. I like John Force as much as the next drag racing fan but they can calm it down. I did, however, see my local Wal-mart is carrying Peak DEF for $12.47 for 2.5 gallons ... right next to SuperTech for $7.88. The DEF from O'Reily's, AutoZone, Advanced, etc, etc, are all going to be made by someone on this list.
Personally, I have run Kleen DEF from Menards, SuperTech from Walmart, and ... well, I guess that is about it.
Valvoline and SuperTech (Walmart) apparently have their "own" manufacturing facilities.
Then again you can buy one yourself if you have the cash.
AdBlue at it again ... milking the public since elected officials.
As for at the pump or in large containers, it depends on volume of use. For a trucking company with the facilities to handle it, they can get a tank and a truck fills it up on demand. For the home user no where near a reliable truck stop, the jugs are the least efficient, most expensive, and hardest on the environment way of getting DEF to the end users truck. I refer you to Lucky Dog's post in this thread
The art of confusion by the eco-nuts.
Edit: The "real" nut buster is the fact if I do get some "bad" DEF, the eco-nuts have coded it in to shut my truck down until I have it service by the stealership. If you need proof that big companies have their fingers everywhere, well here is some more. It doesn't take a rocket scientists to pull the plug on a tank and drain the DEF out. It's liquid fertilizer so I suggest spreading it real thin on your garden or lawn. Yes. Urea is fertilizer. My in-laws use it. Flush the tank with clean water, flush the lines. Let it dry. Refill and move on with life. NO! Instead they design a tank with built in sensors, no drain plug, and built by one frack wit of a company that can charge whatever price they want for replacement parts. Sounding like the public is getting taken for a ride they won't have fun on? Oh, yeah. All to save some NOx from escaping when I probably breath in more toxins from my neighbors with their bags of fertilizer they have no clue how to properly apply.