So, I found a few sources as far as bulk costs for memory.
That said, I'm an idiot and not sure what I'm even looking at or what I should be looking for in the first place! Hopefully the more tech-inclined here can help out in figuring out costs! Here are the links starting at the primary landing pages to search for memory:
https://www.arrow.com/en/products/memory
http://www.digikey.com/product-search/en/memory-cards-modules
http://www.futureelectronics.com/en/Search.aspx?dsNav=Ro:0,Nea:True,N:716
Now, I realize a large company could likely get a better deal behind the scenes, but this is the best I can find where you can look at unit costs in fairly large numbers.
Again, though, I'm just at a loss of where to begin searching here! Is EEPROM better than plain PROM? Are they sure they mean bit? What's class speed got to do with it? I would be so grateful for Tech-GAF's amazing expertise in figuring this all out to cover my ignorance! Be a hero!