Re: Where have I seen this before?
Not entirely wrong.
One should note that back then...
1) There was no internet and no online shopping, and you're sitting in semi-rural Germany with only a handful of stores where you could buy calculators with knowledgeable sales personnel.
2) There were tons of different scientific calculators.
3) There were tons of different (but mostly identical) calculators *from the same company*, some of which were specially made for schools, and/or for *German schools*. From the teacher, you wouldn't get just a TI-30, you would get the TI-31 EDU DE (that's paraphrased, not a real model number, but you should get the gist). Functionally identical to a TI-30, except for one function disabled (that Germans educational boards wouldn't want kids to have), and one button labeled with the German expression instead of English. Except that in stores you wouldn't find the TI-30 anyway, but only the TI-32 DE Special Edition...
What should a parent do who do not want to do work for the kid's school supplies, didn't know anything about calculators, didn't WANT to know about calculators (they all look the same anyway) , much less do work for MATHS CLASS that everyone hated anyway? Just pay the protection money and collect bonus points from the teacher...