I am not a paper cup...
This is the best purchase I've made in a while -- it's DCI's I'm not a paper cup porcelain coffee travel mug.
It looks like those paper cups you can get a coffee shop but is 100% reusable -- the cup itself is made of insulated porcelain and the top is silicon. It's microwave and dishwasher safe. The biggest drawback is that it only holds about 6 ounces - I prefer a little more tea than that, but the tradeoff of not using an actual paper cup makes the lost ounces worth it.
I got it at Myxyplyxyk in NYC but their website is temporarily down. They also had them at Exit 9 and a few other "gift shops."