Hmm... I really need something cheap initially. I'm starting a minigames server and will be paying out of my own pocket until I can get some donations. Any other cheap suggestions?
Seriously guys, experienced programmers have looked in Minecraft's source and have never found anything. The troll that originally made up Herobrine even admitted that it was a fake. Someone is either trolling you or you're making it up.
I'd keep 10,000,000 and give the rest to assorted charities and stuff. I'd probably also "accidentally" drop wallets full of $100's in front of homeless people.
Sometimes map creators put the actual map folder inside another one along with a readme file. Try looking in the folder to see if the map contents are inside.