Princess Auto: Powermate Air Ratchet $15.8 @ Princess Auto

3/8 Air ratchet for $15.80 at Princess Auto. You supply your own air hose and compressor.

Looks similar in size and style to the Milwaukee 12V tool that was $99 recently (with battery and charger).

Max torque 60 lbs /ft which is double the Milwaukee spec.

Brand is 'Powermate.' Quality unknown. I haven't used this one, but the price is right for someone who wants a powered ratchet and is on a tight budget.

Here is a similar one at Homedepot.com for $34 USD. The few reviews are positive.