My concern with cheap programs is that no matter the price, I am still accountable for results. Do not like to get into "this will cost you extra" or "what about that type of weed?" Atrazine, simazine, prodiame. and Three Way cover a limited spectrum of weeds found in centipede. Right now, I have got a 1/4 acre centipede lawn from h-l. It got Tenacity last week and I will be doing it again week after next. That will be followed by Celsius or Manor and Dismiss depending on what is still left in the lawn. To the OP: any yoyo can pour a bag of fertilizer into a spreader. You had better believe the knowledge needed to do weed control is worth something. Not to mention doing it selectively. People have been told that a herbicide costs x dollars per ounce and what value do they care to assign to knowing how to apply said product so it controls the weed and not remove the lawn.
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