Please send us your suggestions for Turkey and help others to get a reasonable SIM-card for their next trip!
Currently tourists are only allowed to take one personal device with you, which you can use for up to 60 days via roaming or a local SIM card.
After this 60 days grace period the device has to be registered (i.e. paying a registry-fee of currently approx. 40 €), to further be able to use it in Turkey.
That's why I am planning to list alternatives to local SIM cards here soon.
International offers and reseller with international shipping: