Amazon offers the SanDisk 128GB Ultra UHS-I microSDXC Memory Card, model no. SDSDQUA-128G-G46A, for $119.99 with free shipping. That's the lowest total price we could find by $80. It comes with an adapter and purports to be water-, temperature-, X-ray-, magnet-, and shock-proof.

Of note, this item is currently out of stock but will ship at this price when available.