Michael's has a paint called American Accents Designer Metallic "Aged Bronze." It comes in a box but it is a single can, not one of those two-part paint sets.
Or Wal*Mart usually has the Rust-Oleum "Metallic Bronze."
Either one is the paint for the handle...they are the exact same paint, so if you can find both buy the cheaper one.
Rust-Oleum also makes a Dark Gray automotive primer that is a very close match to the Zynolite Dark Gray for the Hand Phaser. Wal*Mart should have this or can get it.
If you can find a hobby shop or model shop that carries Testors Model Master paint you're home free.
Testors Model Master "Panzer Gray" is a match for the usual Krylon Shadow Gray most use for the Phaser Pistol body. I've seen some variation in shade so I'd buy a couple cans if you can find it.
I don't know if you can buy it direct from Testors but they would probably have more info or a store locator on their website.
Also, while you're in Wal*Mart look at the house paint samples. While I doubt you'll want to use house paints on your phaser the color swatches can be helpful to see if an alternate paint is the right shade.
#96404 "India Ink" is an almost exact match for the Hand Phaser paint.
#96434 "Troubled Sky" is an exact match for the Shadow Gray Pistol body paint.
WOAH! The paper models on that site just ROCK! (Sorry to be derailing your paint thread here..) The Cobra-Head Phaser looks nice and easy to build, I think I'll give that one a try. Anyone interested in building me a TOS P1-P2 set?