The two instruction outfits that I am familiar with (2 largest in Chicago)...
both are overstaffed. One place advertises "guarantees jobs" to anyone who starts CFI training, and thus now have lots of instructors with few students.

The other place i'm referring to...hired several new instructors but have had nowhere near normal attrition due to hiring, so there are lean times for everyone...young CFI's with thousands of hours TT/ hundreds of hours of multi...

As a Purdue grad, the school went from being 2 full time-instructors understaffed as recently as spring 2008 (salary, benefits, constant student load, 5 day schedule) to (obviously) not hiring anyone anytime soon.

The ab-inition places out west are always advertising for CFI's, but beware of unusually high "pay scales"...I have had several friends get burned by such places in the last year.