The 200GB Sandisk card is on sale as part of Amazon's Gold Box Deal Of The Day for Sandisk's mid-range products. Can't beat $60. However, the read/write speeds on the card aren't great, so transferring content to/from the card via an the included SD adapter is a slow and painful process in my experience. If you pick up a Sandisk USB OTG flash drive in today's sale, it will alleviate the difficulties of transferring files as the phone can copy files to/from the drive using Sandisk's backup app or other software much faster than you could ever pull off with the SD adapter.