I've recently been watching the PBS show "The Mind of a Chef" and noticed the plastic containers the chefs use to store ingredients as part of their mise en place. To me they seem like a better alternative to other methods such as the custard cups Alton Brown uses which I find clumsy and annoying to use and wash.
The containers are stackable and come with lids and seem relatively sturdy. Seeing as they keeping quite a lot of them at hand, my guess is that they are disposable and / or cheap to acquire.
I've been browsing some online restaurant supply stores, but the only storage containers I could find in similar sizes are quite expensive at around 1.5€ each.
Is there a specific name these containers are sold under?