The DCI "I am not a paper cup" porcelain travel mug seems quite popular and holds 12 oz. There are quite a few complaints on Amazon about the lid leaking, so you might want to be careful with this one.
This Sagaform porcelain double wall mug has 18 reviews at time of writing with very good feedback. It comes in a number of designs including plain white.
It looks like a 12 oz mug, but due to the double wall, it only holds 8.5 ounces. This may be too small for some coffee drinkers. Perhaps well suited to espresso drinkers.
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