This last time I went to Costco there was lots of yeast but very few bags of flour (like 8??) with a "limit 1" on the flour.
I bought a 2 lb yeast for my friend in Arizona who has flour but no yeast and sent it to her as a Seattle Care Package. I used a medium flat rate box and included 2 rolls of "the good stuff" Charmin toilet paper as packing material, a small box of tea (she's an ice tea drinker), two packages of her favorite snack cake, and a small rock from my yard.
I wrote on the bag I put the rock in: Yes -- it's a rock. Why? Because it's a flat rate box and I think I'm funny.
Fortunately, she thinks I'm funny too. Even if sometimes it requires explanation and it's still defies explanation...