I was looking at my local Craigslist for sale classifieds, and found a guy selling the original manual Fusion refills dirt cheap. He bought them at an auction when a store was going out of business and liquidating their stock. He told me he literally has enough boxes of them to fill the back of his hatchback.
Get this - I just scored 12 4-packs, and 7 8-packs. 104 refills in all...for $80! 
I only shave 2-3 times a week at most, so Gillette will probably stop making the Fusion before I'm in danger of using these up, and he has tons more...LOL.

I did pretty good, don't you think? 

Hey Tom,

I've been a Fusion user for several years now, so I'll be making out great. I just decided to stock up when I saw this deal. 

They appear to be genuine Gillette. I'll need to find my magnifying glass to get a better look, but I'm confident that they are not fakes.