SANDISK 512GB GamePLAY microSD Express Card - Works with Nintendo Switch™ 2, Up to 880MB/s Read, Up to 650MB/s Write - SDSQXFN-512G-AW6GN

Best 1TB: Costco Lexar Play Pro https://www.costco.com/p/-/lexar-play-pro-1-tb-microsdxc-express-card/4000399472 Best 512GB main brand: $100 Walmart Sandisk https://www.walmart.com/ip/seot/16003402425 Cheapest 512GB: Can find the Gamestop one on Ebay for around $80 https://www.ebay.com/itm/157541877680

It appears this card and a variety of other ones are off branded Lexar cards https://www.reddit.com/r/NintendoSwitch/comments/1pbt4xp/psa_longsys_lexar_makes_lexar_onn_next_and/ Should be fine, but for $100 I'd probably buy one of these https://www.walmart.com/ip/seot/16003402425?listRegistryId=fd6a6610-9a33-4e6c-bd3b-e55c3dc30db0&listRegistryType=WL