At this point in history, 200GB microSD cards are a luxury few people are ready to jump on. But if you absolutely must have everything saved on your phone and accessible at all times, the option is there. It's just going to cost an arm, a leg, and over a couple hundred bucks. Fortunately, Amazon's price has dropped a tad. You can now get one for $220.
Yeah, that hardly qualifies as cheap, but it's less than the $240 Amazon originally sold the card for and the $250 it still costs at Best Buy. Though, honestly, why not just get a handful of 128GB microSD cards for $60 each? That's 512GB of storage for roughly the same price.