Think I mentioned several hundred posts back that Turkey appears to have outlawed DCC at POS terminals, even though some shops still have Garanti Bank-issued promotional materials for DCC sitting around.

Unfortunately, US-issued chip and signature cards continue to face issues with acceptance at the offline terminals used by many shops and ATMs are indeed very aggressive (and occasionally misleading) about DCC. I recommend drawing cash from YapiKredi if you want to avoid DCC offers.

The practice of quoting prices in Euros and then converting to Liras before imputing the total amount into the credit card machine is unfortunately alive and well in some resorts with a Eurozone clientele, though this is not true POS-enabled DCC. I usually check their calculations for myself with the XE.com app before signing the slip in these situations!