I went to a local franchise pool store to purchase 4 Lb. CYA. Cost was $35.99. This to me appeared expensive and I suspected that I can do much better if I shop around.
Walmart's cost was about $14.99 for 4 lb. of 96% cya.
Lowe's cost was about the same for 4 lb. of 100% cya.
Makes one wonder how some of these franchise stores manage to stay in business.