Excellent question.
Unfortunately, I don't have a good answer, as this has become something of a peeve of mine as things have gone along. This year, parents have been asked to provide copy paper and (office supply store chain name deleted) gift cards, among other items, and at the rate things are going, I would not be at all surprised if there were a TP drive later in the year!
I can understand "brand picky" on certain things, say a particular type of headphone for use with the computers or calculator with specific features -- and even there, there's probably some leeway. But "run-of-the-mill" stuff like pens and dry-erase markers?!? Sorry, but somewhere in there the saying "beggars can't be choosers" needs to come into play, IMO. As you point out, things are tight -- all over.
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BTW, we're (still) in storm-watch mode here -- and I thought we'd be coming out of it by now. NOT!! We're just *now* getting the very early bands. The latest has us getting the brunt of it late tomorrow/into Friday (subject to change without notice, of course). We have been in the "cone of uncertainty" since Sunday, and now it looks as though we will be in and out of the soup until well into Saturday. At least the latest predictions have it weaker than before.
Prof