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newegg.com has a couple of Samsung 850 drives included in their 72 hour promotion. These might make good options for those looking to use the $ 10 off AMEX offer. For the 850 EVO 500GB, you could forego the $ 2 off promo EMCAVKA24 and apply the student 10% discount currently underway if you are eligible and stack that with AMEX offer.

AMEX $ 10 off order thread
Student 10% offer thread

SAMSUNG 850 EVO MZ-75E500B/AM 2.5" 500GB SATA III 3-D Vertical Internal Solid State Drive (SSD) [newegg.com]
Price = $ 159.99 w/FS after applying code EMCAVKA24

SAMSUNG 850 PRO MZ-7KE256BW 2.5" 256GB SATA III 3-D Vertical Internal Solid State Drive (SSD) [newegg.com]
Price = $ 130.59 w/FS after applying code EMCAVKA23