[quote name='Mafiacrooks']Get the Third party.....they will work anyway[/quote]
Do this and you'll need to serve many hunks of cheese at your whine party. There's nothing more classic than people complaining about their crappy 3rd party controller being the reason why they can't get a headshot anymore (the real reason being that most of us haven't played it for many years and aren't used to the subtle nudging required).
Online probably won't be the best place to get them. Check any local mom & pop video game stores if you have any.
Once you've invested in 3 more controllers, go ahead and plunk down a bit more for an N64 Expansion Pack and Perfect Dark.
If you can't complete your N64 quest, go for something like Timesplitters 2 or 3 on the PS2. It's just as satisfying as the golden days, but has better graphics and undead monkeys.