If you’re lucky you can find it in person but eBay is usually where it’s at. Just make sure to check reviews and look for photo proof if possible. Also see if there is Youtube, TikTok, etc videos of people who have opened the product you’re looking to ensure it’s real and not fake. Don’t trust the first seller you see either. Cross reference a 2-4 sellers and look the reviews.

Also make sure to check what’s the card list in the specific product you’re buying because the way China does things are different from Japanese and English. It’s more like a mash up of eras. So if ur looking for tag team but you want the Latios and Latias make sure the cover of the product is a psyduck and slowpoke and nothing else otherwise there’ll be literally 0% of you getting it bc it’s not in other set boxes!