I have been doing a lot of research on psyllium products lately, hunting down the best deals. I found this thread which is interesting and helpful... but I think you all might not be correct about the Equate being cheaper. If my per pound calculations are correct, SandClear is actually cheaper than the Walmart Equate when you buy it in bulk.
Hopefully I can make this make sense:
You can buy a 1 lb 13 oz container of Equate at Walmart for $8.84: Equate Fiber Original Texture NBE to Metamucil Fiber Powder - Walmart.com
You can buy 20 lbs of SandClear from Drs. Foster & Smith for $84.99: Fiber Supplement for Sand Colic in Horses: SandClear by Farnam for Equine Digestion
1 lb 13 oz is equivalent to 1.8125 lbs.
$8.84 / 1.8125 lbs = $4.88 per lb for Equate
$84.99 / 20 lbs = $4.25 per lb for SandClear
Anyone who feels so inclined can check my math. It's late and I'm an English Lit major. If I'm correct though, SandClear ends up being $0.63 cheaper per pound... which adds up if you're going through a lot of it.