OK. Went to Walmart today. Normal SuperTech Dexron-III(H)/Mercon, complete with GM license number, $1.81/qt. High Mileage SuperTech Dexron-III(H)/Mercon-V/ATF+4, no GM approval number, $1.97/qt.
They only had 4 bottles of the High Mileage stuff. They were a bit leaky as well. Either way, I didn't think that I'd reap any benefits from the HM fluid if I was only putting in 4 quarts, a bit more than half of my unit's capacity. So, I ended up grabbing 5 quarts of the regular stuff.
Another interesting note. SuperTech also has a Multi-Vehicle ATF that meets the same Dexron-III(H)/Mercon-V/ATF+4 specs, but is priced at over $3.00/qt. Yet, this HM fluid meets the same specs and also has HM advantages...and is priced at $1/qt less ??? Hmm....