I’ve been using Airalo for a couple years now to get cheap data during international travel. I’m sure there are cheaper local/physical store options, but the ease of getting access to local cellular network with a couple of clicks cannot be understated. Airalo supports 190+ countries via esims, it’s amazing

Airalo $3 off referral link for anyone who wants to check it out - https://ref.airalo.com/nLLz