Commercial Logic

Pander and I have an ongoing debate about his Halloween costume. He chose one last year during the post trick or treat clearance, and has since decided he doesn't like it. The costume he picked is a GI Joe Black Ninja. I think it is awesome, so I am not willing to spend more money so he can change his mind.
Last night, we tried on costumes because next week Pander and Fia have a Costume Parade at school and I wanted to make sure everything fits. Fia's hippie costume was too big (she is a tall, skinny stick so this is a common event and she wasn't upset) so she will be wearing the sparkly soldier outfit I picked for MooMoo. Moo will be wearing the ballet costume Fia used for her last dance recital now, and she is thrilled. Noodle's Zookeeper costume was a perfect fit, yay. Now we get to Pander.
Pander's Ninja costume was a perfect fit, thank goodness. But he HATES it. "It's too long." "I don't like that it covers my face!" "Without the face cover, it just looks like a hood!"  No matter what I tried, he wasn't happy. So he took it off and I gave him a decision to make- he can wear the ninja outfit, or his karate uniform, or no costume at all. He stomped off to his room and I didn't see his angry little face until dinner.
Fast forward to this morning. I am still laying down, not even out of bed yet, when Pander approaches with a new attempt to sway me. "My brain was thinking on my 2 costume choices, and my brain decided no to both of them." Way to blame your brain, dear. I reminded him of the money we spent on his costume and told him we will not be buying a different one. He then broke out with his Commercial Logic. "Didn't we buy this costume from Target?" Yes, we did. "Target says to Buy more, pay less. I want to follow that direction." We did buy something there and we did pay less because it was on clearance. "But I want to follow the direction that says to Buy More, and you always say we have to follow directions!" Insert big, cheesy grin that says he feels there is no way he can lose this discussion now because he has used my own rule to defeat me! Sometimes, there is no reasoning with a 6 year old. So here is where I pull out the arguement that all mommies swear not to use, but do anyway. "You are not getting a new costume, no matter what Target says, because I said so!" Maybe next time he'll ask about this when I'm awake and out of bed, and I'll think of a better way to battle his commercial logic.