That isn't low, that's ridiculous. I think local roof crew is going to charge at least $60 to $65 per square plus something for the chimney. Dimensional shingles are probably running around $66 per square plus sales tax so say $71 per square. I would think at minimum, you're at $100 per square for materials. So you're cost is at least $160 per square. Now, deduct tear off, you're still at $140 per square for your cost.
Workman's Comp for roofing in Alabama is $40 to $42 per square. I turned a cash bid job in Birmingham away today for 40 squares, $10,000 ($250 per square). I told the guy if it were Jan or Feb and we were trying to keep one of the good crews fed, I might consider getting close to that but normally would be in the range of $12,000 for a cash bid and higher right now due to the hail storm there.
Bottom line, even in that market, I can't imagine doing those jobs for less than $225 to $235 per square and I'd have to be fairly hungry to consider that.
Also keep in mind, labor has gone up due to all the storms. Rates in Birmingham have gone up almost $20 per square if you want a good quality, full crew with insurance.