On our next to last day in St. Romain en Viennois we went to the local Intermarché, where I purchased a Mini Kit Incassable in the school supplies section.
right triangle 45-45-90
right triangle 30-60-90
I'm pretty sure it is not possible to buy trigonometry paraphernalia in U.S. supermarkets.
I also scored a Travaux Pratiques for writing proofs and a Vocabulary Coach for memorizing Spanish & French vocabulary. Vocabulary Coach is very cool.
The Intermarché is a big-box Target-type store, like Meijer's in the Midwest.
When I get back to Springfield, IL in a couple of weeks, I'll see if Meijer's has right triangles idéal pour la trousse.
I'm guessing no.