Coffee shop supplies

I'm coming to Istanbul in 12 of September for a business trip. I'm looking for coffee supplies such as coffee,syrup, flavored, tea, could drink as moka,,,,etc. Also I'm looking for frozen pastry , savories and patisserie such as Croissant, sandwich, mini piazza, donut, puffs, muffin, frozen cake, cheese cake , cup cake,,,,,,etc. I really appreciate your help.