Question for our Turkish friends about sourcing hardware in Istanbul

A friend of mine is returning to Turkey to visit family in Istanbul.

Currently she is using loaned hardware I had available. We just don’t have a good source of this type of equipment here so she wants to buy a setup when she is back home. Where would be a good place for her to go and buy a nice touch-screen terminal and printer? ANd if you have a recommendation of a place, what system/hardware would you recommend?