The Quality of the ammo has been good for my on the Blazer Brass .45 ACP I've been shooting for a couple of years. Sounds like Walmart must have standardized prices on the .45 stuff. That's the same price I pay for mine.
IMHO, the prices you paid are really pretty decent, about as low as I can find.
Here in Oklahoma, Walmart has the cheapest .45 ammo while a local Academy Sports is about $2/box cheaper on 9MM ammo ($7/box of Blazer at Academy and closer to $9/box at Walmart).
Just have to keep your eyes open to other options that are available in your area and pick and choose. I've found that a little bit of looking around and you end up spending less on box quantities than you would going through the internet and pay shipping for whole-case quantities....every once in a while I've found deals online that were worth a look.