I have a Squier Jagmaster, a good guitar i guess but i want to customise it so pickups are the first thing that come to mind.
A local guitar shop, ebay, craigslist, countless online stores, like guitarcenter.com musiciansfriend.com music123.com, there are a whole hell of alot of others out there too.
bare knuckles allllll the way!
What amp are you playing through? Because that may benefit your tone more.