The thing is that the alternatives, might get worse with time.
-Anazon doesn't charge taxes yet. The thing is that they charge way too much for shipping (usually $10 for just a game) amd Prime costs the same, but free shipping is standard/Parcepool, even though they do use UPS for 1 day and 2 day shipping. The government has been trying to get into them, so that may also result in them starting to charge taxes.
-Best Buy while does have Unlocked, they rarely match prices from the US, no store pickup and just don't ship anything to PR. There aren't many stores, and they are more recent than Gamestop, so maybe they did paid such taxes from day one. Hence why they operate in many things, separate from the US.
-Toys R Us is the closest to Gamestop, when it comes to matching prices, offers and store pickup. There are literally 2 stores only, with a few smaller one too far from each other.
-Wal-Mart is a mix. They sometimes match offers, sometimes don't. No store pickup, but you can check inventory online. They ship some things, but others not. Wal-Mart is also in the brink of abandoning PR for the same reasons as Gamestop.
And is not like things might improve. Target tried a few times to open stores in here, but the main thing that stopped them (outside the rising costs and taxes) was that a local place called Target Rent a Car, with the same logo too; has been operating for decades and wanted money from them to use the same name and logo. And with the current situation is even more doubtful they'll consider again.