Altosid 0.4% which is used in the manufacturer of Purina and other fly control mineral is $3.00 per pound.Wind and Rain with Fly Control contains 0.014% S-Methoprene, according to the label. I understand there are other salt and mineral benefits to Wind and Rain with Fly Control but you can buy minerals for less than $10 per 50 lbs. Wind and Rain with Fly Control costs $47.99 per 50lbs at my local TSC. That extra $37.99 can be attributed to the minuscule amount(0.007 lbs) of actual IGR fly control product. Although I didn't include the value of the minerals in my original post, IGR is still pretty expensive by the pound.
I use to get Altosid 2.00% but the company quit shipping it. Even had to take an online orientation sort of thing before they would even sell it. Now the .4% is all I can get. It's $154.00 for a 50 lb. bag, or $3.85 of product in each bag of mineral. IGR mineral should be about $5.00 per bag higher than the same mineral without it.I bought Purina W&R high mag with fly control P96623 today at local Co-Op for $30.30 per 50 pounds .
Seems like a lot of price difference