Didn't you get the memo: Slow release urea is supposed to be the do all, be all and end all for lawn fertilization. Using AS is antique. Why would you have to find AS in a Wallyword? Is it because the treehugging granola eaters banned it for professional use because it is not slow release urea? On a lawn with anything over 7.0, I am also throwing in 5 lb of DF sulfur in addition to the AS and micronutrients. Do not try this on lawns that cannot be irrigated after application.
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
Benjamin Franklin 1775
Sell not virtue to purchase wealth, nor Liberty to purchase power.
Benjamin Franklin Poor Richard's Almanac1738