Cool, we've got something to work with.
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.
Hope this helps!