Not as fast as SanDisk Extreme, but if you need the space...
PNY 256GB Turbo Attaché 2 Flash Drive - USB 3.0, 185MB/s Read, 135MB/s Write, Two Tone Grey and Silver With Integrated Capholder - P-FD256TBAT2-GE at TigerDirect.com
PNY 256GB Turbo Attaché 2 Flash Drive - USB 3.0, 185MB/s Read, 135MB/s Write, Two Tone Grey and Silver With Integrated Capholder - P-FD256TBAT2-GE at TigerDirect.com