Silicon Power just released a 1TB microSD Express Card, a next-gen offering that is up to eight-times faster than a standard microSD card. Current PC gaming handhelds can't take full advantage of these cards, but future hardware really should.
The Legion Go S (Windows, Z2 Go) might have the biggest discount of all gaming handhelds this Amazon Prime Day, but I still recommend going with the Legion Go instead. It only costs $50 more, and you'll get a better device out of your purchase.
More powerful than a Steam Deck or Nintendo Switch 2, giving you the full versatility of Windows PC in an affordable package. I've used this thing as a laptop, too.