Well, the decision was made today to finally buy some Souper Cubes for food storage. It was either buy these (or something like them) or buy something else to freeze stock, soups, leftovers, etc. in. I've been using repurposed quart containers from yogurt, but they only last so long with the freezing and thawing (especially the lids), and now that we haven't bought yogurt for a long time, my supply of containers has dried up (to be honest I only had about 6, plus a few Daisy sour cream containers). I don't freeze in glass, in part because my family breaks the jars when they dig through the freezer, but also because I can't pop out frozen stock from a mason jar. We'd already decided that we will be choosing silicone over plastic for most kitchen applications for which glass isn't applicable. (Which reminds me that I need to put Stasher-style bags on my allowed buy list for 2023, for when we finish the plastic storage bags we already have. I plan to keep track of how ofter we use bags and in which sizes, so I can get an idea of how many we might need.)
I feel like this was a grey area purchase. If I were purchasing deli-type containers they would probably just be considered the same as buying foil or plastic bags, and I wouldn't even be thinking they weren't an approved purchase. Plus, as a couple of other posters have written, I cook all of our meals at home everyday, from scratch, with the exception of a 1-2 meals out monthly for special occasions such as extended family birthdays. For 2023 we committed to coming up with at home solutions for those times when the day goes sideways and we still need to eat, which is one reason I'm freezing more cooked meals. At the same time, they do cost a lot more than just buying deli-style freezer containers (in part because they are safer than plastic, more environmentally sound than plastic, and last longer than plastic).