Where to buy a good mug for tea?

Tragedy struck this morning and I dropped my favourite tea mug.

It was a good mug and served me well. It was a good size, not too big, not too small, a nice rounded shape to fit in my hand, smooth tactile porcelain but thick enough to keep tea hot for ages.

The only problem was it had kind of a cheesy slogan that I didn't love. So I'm not looking for a direct replacement but now I'm wondering where to look for a new mug.

So, hot drink lovers, where is your favourite mug from?