Looks like the price has gone up since 2015.. It's August of 2018, and your specific drive is sold out on Crucial, but a refurbished version (which sounds like a horrible idea for an SSD) costs over $400 currently..
I've been searching for the same info.. A 2.5" 2tb 7200rpm Firecuda with 64mb of nand costs $97ish, but a 2tb 5200rpm with 8gb costs $90. A 1tb SSD is around $200 at best.. I just don't understand why seagate wouldn't have a 7200 version with larger nand.. Wtf can you do with 64mb? That sound's ridiculous.. it's 2018 ffs. And SSDs aren't 'that' cheap..