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Various Retailers have 256GB Samsung PRO Endurance UHS-I microSDXC Memory Card w/ SD Adapter (MB-MJ256KA/AM) for $ 29.99. Shipping is free.

Various retailers also have 128GB Samsung PRO Endurance UHS-I microSDXC Memory Card w/ SD Adapter (‎MB-MJ128KA/AM) for $ 15.99. Shipping costs will vary by retailer.

Available:
Samsung

B&H Photo Video free shipping

Amazon
Shipping is free w/ Prime or on orders of $ 25+.

Features (256GB):
256GB Storage Capacity
UHS-I / V30 / U3 / Class 10
Max Read Speed: 100 MB/s