Maybe we can make this into sticky worthy material - if it already exists it should be stickied.
A list of all places to buy / order custom and not so custom parts. Post yours up and I'll add them into the OP, as well as any comments you may have.
Custom / special order
Armadilloguitar.com - never dealt with them, but they have nice unpolished stainless steel bridges, control plates and knobs of all kinds. They also do custom work, brass and aluminum.
callahamguitars.com - a whole bunch of polished stainless steel stuff: tele, strat (incl tremolo) and TOM. They also have retrofit slotted head ss screw kits for tele. They also sell electronics, pickguards and pups, ready to go hardware kits, and prewired control assemblies.
DangerousR6 custom deep engraved neck plates. And maybe other stuff like ferrule bars.
glendaleguitars.com a bunch of tele parts mostly - some interesting stuff. Nickel or chrome plated cold rolled steel. Titanium too. They have Billy Gibbons style tele bridge. Tele bridge pup mounting ring. More saddle styles than you can imagine.
ruttersguitars.com custom tele parts, steel and aluminum. Only place I've seen a vintage correct snakehead bridge.
Not so custom / mass production
azguitarparts.com limited selection of bridges etc.
guitarfetish.com lots of cheap parts, electronics and pickups. Mixed reviews online. Some of their stuff is hard to get otherwise, though. Blank tele control plates. Kits.
guitarpartsresource.com pretty broad selection of... Guitar parts.
Stewmac.com If you're an UW member and you don't know about stewmac - you may need more help than what we can provide.
A list of all places to buy / order custom and not so custom parts. Post yours up and I'll add them into the OP, as well as any comments you may have.
Custom / special order
Armadilloguitar.com - never dealt with them, but they have nice unpolished stainless steel bridges, control plates and knobs of all kinds. They also do custom work, brass and aluminum.
callahamguitars.com - a whole bunch of polished stainless steel stuff: tele, strat (incl tremolo) and TOM. They also have retrofit slotted head ss screw kits for tele. They also sell electronics, pickguards and pups, ready to go hardware kits, and prewired control assemblies.
DangerousR6 custom deep engraved neck plates. And maybe other stuff like ferrule bars.
glendaleguitars.com a bunch of tele parts mostly - some interesting stuff. Nickel or chrome plated cold rolled steel. Titanium too. They have Billy Gibbons style tele bridge. Tele bridge pup mounting ring. More saddle styles than you can imagine.
ruttersguitars.com custom tele parts, steel and aluminum. Only place I've seen a vintage correct snakehead bridge.
Not so custom / mass production
azguitarparts.com limited selection of bridges etc.
guitarfetish.com lots of cheap parts, electronics and pickups. Mixed reviews online. Some of their stuff is hard to get otherwise, though. Blank tele control plates. Kits.
guitarpartsresource.com pretty broad selection of... Guitar parts.
Stewmac.com If you're an UW member and you don't know about stewmac - you may need more help than what we can provide.