Because a "half-sandwich" at Whole Foods is made with two slices of regular bread, and getting an entire sandwich for the price of half seems like a great deal. But a half sandwich costs $4.50 which seems like not a great deal. Great deal or not a great deal? Confusing feelings like this can lead to indigestion and there's only one cure for indigestion: sandwich math.
My parents are mathematicians and my sister owns an abacus. I wanted to find out if it was cheaper to make a sandwich at home.
Step One: solve for cost of sandwich.

Here is a drawing of the equation, because food is my fourth-favorite thing to draw:

Here are my top five favorite things to draw:

Step Two: go to Fred Meyer at night and find the price of all the ingredients, which happens to be my fifth-favorite PG thing to do at night.

While I was traveling from bread to cheese I noticed that a loaf of regular bread costs about a dollar and has twice as many slices as gluten-free bread. Gluten-free bread is really expensive. That kind of bummed me out but I cheered up fast because hey, I'm price checking food at the grocery store.

At this point I was pretty confident that the Whole Foods sandwich would be cheaper. But I wasn't sure! Is the suspense killing you?! I bought some eggs.
Then I went home and added it all up while listening to Oh Yoko and playing a complicated kind of scrabble with a stranger on my phone. I hate scrabble. I lost badly. But that was the only bad news because look at this:

Making your own sandwiches is TWO TIMES CHEAPER (capitalization for emphasis). This is insane. At this price I could eat two sandwiches (is this why it's called a half-sandwich?), or one sandwich wrapped in origami paper and covered in stickers from Powell's.
If times get tough or I need to save money to buy an electric keyboard, I might start making sandwiches with tortillas instead of bread, which will lover the price of a sandwich to $1.60, the same price as the same sandwich made on regular bread. If you can eat regular bread you're getting an amazing deal when you make a sandwich.
Brooke's favorite food age 7-9: cold hot dog wrapped in a tortilla.
Five least favorite things to draw. (it's a matching game!)
Five least-favorite things at night. (it's scary!)
I didn't include the price of mustard. Has anyone ever heard a funny cut the mustard joke? Besides "Has anyone ever heard a 'cut the mustard' joke that cut the mustard?" That one is hilarious.