72000 miles sounds suspiciously low for this vehicle.  Get a good mechanic to check it out.  I'll bet it's more like 172,000 miles. 

I've always been into Trans-Am's and Camaro's. Between those two 4th gen F-bodies, I've had my fair share (8), if you include all generations (18). Without knowing more it's hard to say. Auto transmission is not as desirable as the 6spd. Like @Doc said, suspiciously low price for a Z28 with 72k miles. One other thing is, make sure it's a real Z28 Camaro, could be a Z28 clone. Not saying they don't exist, but good "garage queen", not driven hard, adult owned, usually go for $19k and up. V8 muscle cars from that era ( Mustang GT's included) were driven hard and put away wet. Have it thoroughly checked out and be cautious if buying it.