Ends tomorrow. Newegg has the Patriot PSF64GSPUSB Supersonic Pulse 64GB USB 3.0 Flash Drive for $35 - $10 off with coupon code EMCWWVV73 [Exp 11/28] = $25 with free shipping. Goes for $37+ elsewhere. Just 2.3" long and less than 0.7" wide.
Best Buy has the SanDisk SDSDQU-016G-AB46A Pixtor 16GB microSDHC Class 10 Memory Card for $9.99 with free shipping. Sells for $14+ elsewhere. Features water resistance up to 1m deep, shock resistance up to 500Gs, and transfer speeds of up to 30MB/s.
BuyDig.com has the Toshiba Secure 16GB Ultra SDHC UHS-I Class 10 Card (PFS016U-1DCK) for $15 - $5 off with coupon code MEM01 + $0 shipping = $10 shipped. Features up to 30MB/s transfer speeds. Includes a Digpro memory card wallet with purchase.
Staples has the Sandisk 16GB Ultra SDHC UHS-I Class 10 Card (SDSDU-016G-A46) for $10 with free in-store pickup. Shipping option is $10; free on orders $20+. Features up to 30MB/s transfer speeds, and is water-, temperature-, X-ray- and shock-proof.
Tiger Direct has the Patriot Memory Flex PSF32GFXUSB USB 2.0 Flash Drive for $18 - $8 rebate [Exp 12/14] + $0 shipping = $10 shipped. Features a slim compact design and transfer speeds of up to 20MB/s.
Update [11/23]: Potential issues with product authenticity, so we've expired the deal. Thanks for the feedback.
eBay with Tumbek has the SAMSUNG 64GB microSDHC Class 10 Memory Card for $27 with free shipping. Features up to 24MB/s read and 7MB/s write speeds. Card is waterproof, shockproof, and anti-magnetic. Includes an adapter.
Newegg has the Mushkin Enhanced Ventura Pro 64GB USB 3.0 Flash Drive (MKNUFDVP64GB) for $40 - $14 off with coupon code EMCWWVV72 [Exp 11/28] = $26 with free shipping. Features 120MBps read and 70MBps write speeds.
Newegg has the ADATA DashDrive UV128 32GB USB 3.0 Flash Drive (AUV128-32G-RBY) for $45 - $60 rebate = -$15 with free shipping. A subscription must be activated at time of rebate redemption (can be canceled later). Goes for $25+ elsewhere. Features a thumb-activated capless design and claims transfer speeds of up to 40MB/s.
Newegg has the ADATA DashDrive UV128 32GB USB 3.0 Flash Drive (AUV128-32G-RBY) for $22 - 25% off with coupon code EMCWWWV48 [Exp 11/18] = $16 with free shipping. Goes for $25+ elsewhere. Features a thumb-activated capless design and claims transfer speeds of up to 40MB/s.
Staples has the SanDisk Cruzer Facet 16GB USB 2.0 Flash Drive (Black, SDCZ55016GA46Z or Red, SDCZ55016GA46R) for $7.99 with free in-store pickup. Shipping is $10; free on orders $20+. Includes an additional 2GB of secure online storage.
Update: Now on backorder, but can still be purchased for this price. Backorder status won't last long, though!
Ends 11/23. Office Depot has the Lexar 64GB microSDXC Class 10 Memory Card (LSDMI64GASBNAC10) on sale for $20 with free in-store pickup or $10 shipping to home. $49 at Amazon right now but typically around $60 at most places.