Hookahs range in price a great deal, though you would be hard-pressed to find something for less that 50 TL (roughly $26) - and that’s with some negotiating.
The major variables for price are materials (ceramic or glass, and the type of each), design, quality of construction, and - in the case of vintage or antique hookahs - age.
The biggest selection can be found in the back streets of the Grand Bazaar and Spice Market, but before you go, consider checking out the range of options at a good hookah bar.
A classic is Çorlulu Ali Paşa Medresesi Nargile Cafe, near the Çemberlitaş tram stop in Sultanahmet, also known for its Turkish coffee.
If you see a hookah you like, they may even be able to tell you where they source them.