A "big" amount would be 10,000 which is where I can get you a deal. 100 is nothing to who I deal with and would probably charge you the same amount if you were to get 1,000. Someone here is more suited to your needs. Next time you should probably post how many in the original post. People's definition of "big" varies.
The kid on here who runs www.customdiestickers.com is super legit. My friend bought 50 from him, he threw in a free tee with my friend's logo screen printed on, had lots of colors, and shipped via Priority Mail. Kid is super legit, I would recommend buying from him.