First of all, I want to thank you for your Glass Attic site. It has been my close companion on this journey of crafting! I have been working with fimo for under a year and I am already able to make and sell beads and jewelry. It's been a blast.
Sources for Fimo:
On a previous reply I gave the addresses for Sabuncu. They sell Premo for 3 YTL (a little over $2) if you pay cash. More if you charge it. They had a few other supplies but not many for working with the clays.
There is a large store here called Pratiker, kinda like a Home Depot, and they sell Fimo for 3.50 YTL.
There is another crafting forum called Kosuyolu.net and I met a man also from Izmir on that forum who is able to sell Fimo for about 2.25 YTL. His info from that site is "halojenite, mail adresim firstname.lastname@example.org
izmirdeyim cep: 0 555 375 78 80".
Also, another option is to order from Europe. I have ordered from England, Polymer Clay Pit, and have been able to get orders with very little problems. They have a greater supply of cutters, texture sheets, and colors of Fimo. It does cost a little more to order from them, but I have been very happy with their service and selection.
Are you planning any other trips to Izmir?