Amazon has the PNY U3 PRO Elite 64GB MicroSD Card (P-SDUX64U395PROE-GE) for $24.99 with free shipping for Prime members or on $25+. Features up to 95MB/s Read Speed and Up to 90MB/s Write Speed, class 10 - UHS-I, U3 performance for the most intense.
Has good Amazon Reviews.
Amazon has the 500GB Samsung T5 Portable USB 3.1 External Solid State Drive (MU-PA500B/AM) for $128 with free shipping. Features superfast read-write speeds of up to 540 MB/s, includes USB Type C to C and USB Type C to A cables. Has excellent Amazon Reviews.
Also get it for $130 with free shipping both at B&H Photo Video and Best Buy.
Ends 6/19. Rakuten.com has the 1TB HP EX920 PCIe NVMe 3D TLC NAND M.2 Solid State Drive (2YY47AA#ABC) for $300 - $45 off with coupon SAVE15 = $255 with free shipping. Sequential Read/Write Speeds up to 3,200 MBps / 1,800 MBps.
Amazon has the Samsung MB-ME128GA/AM EVO Select 128GB UHS 3 MicroSDXC Card (2017) for $37 with free shipping. Features up to 100MB/s & 90MB/s read & write speeds respectively; Class 10 UHS 3.
Has excellent Amazon Reviews.
Walmart has the 256GB HP S700 Pro 2.5" SATA III Solid State Drive (2AP98AA#ABL) for $55 with free shipping. List price: $75. Features up to 1GB DRAM Cache for better multi-tasking and durability.