Integral 512GB Micro SD Card

Personally, I wouldn't take the risk. Not least of all for all the random sellers on aliexpress, the fake memory cards that many sell, and the difficulty I've had with refunds with them (aliexpress and the seller offered me no help, PayPal insisted I pay more than the price of the item in postage to send the item back before they refund me, and don't refund postage anymore). So if you get a good genuine one like you have that's great! But personally with how cheap the deals are getting on amazon etc, I'd always stick to a reputable UK seller now. (edited)

Ditto - it might be that the £29.99 price was only around extremely briefly. Way back when I pre-ordered my day 1 Steam Deck, I found this very card brand new on eBay for £29 and immediately bought it (I've never seen it as cheap again). It's worked well in my Deck since then and you'd be surprised at how quickly the Deck loads from cards like this (yes, slower than the internal SSD, but not by a huge margin).