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foam to block mini split vent

when they installed my cassette in my bedroom ceiling they blocked off the vent facing the wall because they said it could affect temp readings. however i later discovered i didnt like the other side of the vent because it was blowing air on my face in bed. i took the cover off and saw they put in 2 thin pieces of foam with adhesive on one side. i took off the piece that covered 25 percent of the opening and put it on the bed side vent to block it.

where do you get such foam? just a big box store? i guess it really doesnt matter what is in the cassette as long as it blocks what i want. but i now want to block one of the vents in my living room because of how it's blowing. or any other suggestions. heck could just a piece of paper or envelope be ok? most of the usage is for AC but i may do occasional spot heating of a room in the winter . unsure how temps would affect cardboard/envelope etc.