It depends on what I'm shopping for. If I'm looking for Gillette Silver Blue, I'll buy from eBay. I've found that they are less expensive there than elsewhere. Of course, regardless of which brand of blade you are looking for, eBay is always worth looking into. Another company that I've bought DE blades from in the past is razorbladesclub.com. They allow you to purchase blades in different quantities, including 100 packs.Title says it all. Just wondering which vendors or sites people buy their blades from.
Prices are good there with free shipping in USDorco Primes I get from Dorco's website.