we live in interesting times is perhaps overused at this point in COVID. I've been in and out of Malaysia multiple times, last time was August 2018 to get the start of my current Non-Imm B (BOI) visa.
The thing I miss the most - is not being able to go anywhere internationally, at least easily. Living in Chiang Mai, being able to go internationally on even 3-5 days holidays direct before COVID was fantastic. Malaysia, Vietnam, mainland China as examples. Hopefully, those days will come back again.
My understanding is that the hotel was supposed to provide it for you to take with you after the first day of test and go. That said, any pharmacy has them. If in stock, you can also get them at 7-Eleven. My last one cost 100 baht but they can be found cheaper