I wouldn't recomend you to take one of those tours to Susak for 90 or more kunas. Better visit the island on your own. Well, you'll have to wake up early in the morning (the ship is due to at 6 o'clock) but it will be far less expensive and you can experience that native sailors live. Try to find barba Ante and listen to some of his storys!
Near your hotel you will probably find a little grocery store. Don’t shop here, as it is probably quite expensive, but go further into town and buy where the locals do – especially at the local market for fresh fruit and vegetables, and it is most likely you could bargin for a better price.
to spare a lot of money, i suggest you to go on market andlike in every town in croatia, you will enjoy so nice so chips so good fruits and vegetables