I would first check the fuse, the flasher going out is relatively uncommon. However, if you still think it's the flasher, it's not difficult to find.
Unscrew the kick panel underneath the steering wheel (2 phillips heads)
Unscrew the metal panel behind that
You'll see the black box located on the right side underneath some wires. It's about 2x1x1 and is held in with a metal bracket and a phillips screw. The replacement part can be bought at Advance or AutoZone