During the main summer season, Rethimno is very touristic. Shops and visitors everywhere, the closer to the beach the more! They offer anything considered "souvenir". Recommend to ask your hotel receptionists for recommendations of local stores.
Olives, Raki, Ouzo and wines are common commodities of Crete origin. Cheapest at the locals supermarkets, away from the hotels/beaches 1kg olives at below â¬2. Aside Oranges/Orange juice, fruits and juices are rather expensive.