I just bought mine from Hoeggers. Two, 2 lbs bags (so I can do a treatment and put the other 3 lbs into Legions own 50 lbs lose mineral mix and 5 lamb bar back flow stop valves. I chose to go there cause Jeffers shipping is insane and I didnt need a 50 lbs bag of it from Valleyvet. Oh and my shipping was only like 7 bucks.
THOUGH, if you have a need for a bunch of it, the 50 lbs bag at Valley vet came out to be less then 2.00 a pound including shipping while the hoeggers came out to be like $7.00 a pound for a single bag and 5.00 a pound for the two, 2 lbs bags.