지만요

Though, as a polite afterthought

It ends the sentence on a but, walking back or softening what was just said: not that I would actually do it, though; I love it, though; they are cheaper than in Korea, though. The thing being contrasted has almost always been said already, so the sentence trails off on purpose rather than continuing. The 요 keeps it polite and a little self-deprecating.

Register: polite conversation