Deus Ex: Human Revolution – Praxis Kit Locations

Each of the LIMB Clinics has two for sale:
LIMB Clinic – Detroit – 5000 credits
LIMB Clinic – Henghsa – 5000 credits
LIMB Clinic – Panchaea – 5000 credits
LIMB Clinics – Detroit (Second Visit) – 5000 credits

Detroit
Sarif Manufacturing Plant – A tutorial pops up showing its location.
Surgical Chop Shop – The same building as Tindell and O'Malley (the Western Apartment Building). Behind a level 5 security panel.
Sewers – In nearest room to the south east of the ladder leading up to the weapon cache in derelict row. Look around for a destructible wall (look for cracks on it).

Hengsha
Bobby Tao – Outside the Hive Bar – Complete the Bar Tab Side Quest by giving the monthly payment.
Bobby Tao – Outside the Hive Bar – Complete the Bar Tab Side Quest by giving the one year protection payment.
Malik – Outside the Hive Bar – Complete “Shanghai Justice”.
Dr. Wong – LIMB Clinc – Complete the Talion A.D. Side quest during your second visit to Hengsha.

Sewers – Underneath the Hung Hua Hotel behind a destructible wall.
Tao Young Medical – Second Floor. Head down the south corridor and enter the right most office.

Picus
Sixth Floor – Desks in the center. Look at the center left desk in the drawer.