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I've seen it in an anime. There was 購買部 in the first season and then it has
been changed into 購売部 in the second season. I suppose they have the same
meaning and pronunciation, but 購売部 doesn't even exist on Jisho. It can't even
be typed automatically.

* * *

The anime is うる星やつら.
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kanji readings homophonic-kanji
How should I read 購売部?
It is [こうばいぶ](https://kotobank.jp/word/%E8%B3%BC%E8%B2%B7%E9%83%A8-497121).
Apparently 購買部 is the correct one, literally meaning "buying department".

According to [this chiebukuro
answer](https://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q13106850633),
since 購 means "to buy", 購買 is the only possibility and means buying.

Practically, こうばいぶ in a school is a small shop that sells sandwiches, pens,
notebooks, etc. Since it is a selling place, 購売部 may look natural but is an
instance where a wrong usage is familiarized.

* * *

As a department in a company, 購買（部門） means _procurement_ (which was the term
used in the company I was working for).
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It should be 購買部, and 購売部 is plain wrong. And you are right, in a lot of words
買 and 売 do share the same pronunciation バイ. 買 means to buy and 売 means to
sell. There is even a word 売買{ばいばい} meaning trade (売り買い, literally both
selling and buying). And that very fact may well have led to some people
mistakenly writing 購売部, but unfortunately it simply doesn't make much sense.

購買 is a Sino-Japanese word that dates back at least around 1,000 years. It is
a 漢語 that originally came from classical Chinese text. The reason that 購 only
collocates with 買 here not 売 is because the kanji 購 means to pay money and to
offer something in exchange for something else, and 買 has more of an emphasis
on getting, receiving things. The two kanji word 購買 may sound a bit repetitive
if you try and take it apart, but so do a lot of two kanji words. Also that's
much less the case in classical text.

Since the two kanji often share the same pronunciation, they have been mixed
up by many people. Contemporary computer-reliant human species aside (most
members of this species have lost the ability to write or spell correctly
without the help of IMEs and autocorrect), even earlier writers made this
mistake. [『精選版
日本国語大辞典』](https://kotobank.jp/word/%E8%B3%BC%E8%B2%B7%E9%83%A8-497121) has
this example from
[中野好夫](https://ja.wikipedia.org/wiki/%E4%B8%AD%E9%87%8E%E5%A5%BD%E5%A4%AB)

> ある隷属国の悲劇（1955）〈中野好夫〉「会社の購売部から品物を前借しては」
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