Always on the alert for these, and already have some lead-free ceramic mugs. The "Lead-safe Mama" blog is pretty skeptical even of any ceramic that says it's lead-safe, b/c some ceramic glazes have proved to be otherwise, contrary to their advertizing...
She does testing on numerous products, and she did recommend as lead-safe these Libbey 15 1/2 ounce Tapered Mugs at Amazon--

You get 6 of them for $25.99. I'm pleased with these made-in-Mexico mugs.
They're sturdy and roomy. Dishwasher safe, and the reviews say they are microwave safe. I love seeing amber tea and milk-swirled coffee through clear glass!
I used to have tea once a day, and sometimes coffee once a day. Now I have a cup of coffee almost every day, so the safety of mugs is more important to me-- apparently, the high acidic content of coffee, plus heat, may be a factor in interacting with potential lead in some glazed cups, so I figure it doesn't hurt to drink my coffee out of glass.
As far as the "cons" of the product-- these cups have a mold seam in the glass, and you will feel a seam on the handle. That doesn't happen to bother me, I'm considering them "rustic", ha. If it were a vintage Depression glass fancy teacup, that'd be different.
Another possible "con"-- they are fairly thick and sturdy, and some might say, slightly heavy. I have arthritis in my hands, but they're not too heavy for me (yet). They are not as heavy as my Temp-tations Woodland mugs.
I still like the look of these. Two can stack safely in the cupboard; more than that would topple. Oh almost forgot another "con"-- the stickers on the bottom don't want to come off with soap, bummer.
But I found that anything that acts like a solvent, will take the stickers off right away. I used white vinegar, and rubbing alcohol works too.
Well, more than you ever wanted to know!! But if anyone is looking for well-priced, utilitarian glass mugs, to me these are a nice option.