I guess I'm far from out of the woods yet.
Back to the drawing board.
Today I checked online and the shirt I bought yesterday is listed online at the running store's website $13.50 cheaper than what it was priced at in the store?! Now this makes more sense when you factor in the fact the store decided to price the thing more than the MSRP. On top of that, I have a code to get 15% of and free shipping online. This brings my grand total of potential savings to $19.57! That's huge. I can feed Mario pellets for months with that money! So I've contacted the manager and will see if he'll credit me back $19.57. If he won't I'm going to return it to the store and order it from their website. If he tells me I have to physically come into the store to get this savings instead of crediting me over the phone, I'm still going to return it at the store and buy it online.
Sometimes I can be spiteful like that.