Where can I get some good old Merkur blades for cheap?

The best, and seemingly only deal I've found for a 100 pack of your regular Merkur DE blades is for ~$47 after shipping. While they give me the best shave I've found so far in my 5 months of DE shaving, it's kind of hard for me to make them my official blade when the likes of Derby and Blue Bird, which I find come in a close second, sell for under 10 cents per blade on Amazon.

TL;DR: Cheap Merkur blades: hook a brother up.