To do most of the work on your car, you'll likely require two torque wrenches ...
6-50 nm 3/8 in drive
40-200 nm 1/2 in drive
Professionals would likely have
Snap-On QD2RN50
http://store.snapon.com/Newton-Meter-Torque-Instruments-Torque-Wrench-Adj-Click-Type-Newton-Meter-Fixed-Ratchet-10-50-N-149-m-3-8-drive-P640978.aspx
Snap-On QD3RN200
http://store.snapon.com/Newton-Meter-Torque-Instruments-Torque-Wrench-Adj-Click-Type-Newton-Meter-Fixed-Ratchet-40-200-N-149-m-1-2-drive-P640982.aspx
Stahlwille 730/5 with 735/5 ratchet head
50180005 Stahlwille 730/5 Torque Wrench 6-50Nm
Stahlwille 730/20 with 735/20 head
50180020 Stahlwille 730/20 Torque Wrench 40-200Nm
Stahlwille catalogue
Stahlwille catalogue
You'll note these are all in the $300-$400 range, so no, $70 is not "pricey" and $10 must be a pet rock. Fasteners on German cars are tightened to newton-meter figures.