CTCStore via Amazon offers the Samsung 256GB EVO Plus Class 10 UHS-I Micro SD Card with Adapter for $88.40 $88.07 $84.68 with free shipping. That's the lowest price we could find by $25, outside of the price below, although we saw it for $3 less last month. It features read speeds of up to 100MB/s and write speeds up to 90MB/s.

Update: B&H Photo Video charges $89.72 $84.50 with free shipping.