SanDisk Outlet Store takes up to 75% off a selection of USB flash drives, memory cards, headphones, and more. Plus, get an extra 10% off via coupon code "10OffOutletFS". Even better, the same code nets free shipping. Some exclusions apply. A couple of best bets, with prices after coupon:
SanDisk 32GB microSDHC Memory Card with Adapter for $7.15 (low by $5)
SanDisk 64GB Cruzer Glide USB 3.0 Flash Drive for $13.27 (pictured, low by $4)
The dollar store is the most amazing place to find bargains for certain purchases. Yes, even pregnancy tests.