The starbucks in my area used to sell the mugs that they also used in-store. They were gigantic (like 700ml?), completely white ceramic with a very subtle logo and only cost 10€ each. They're also extremely dishwasher proof because they were made to be washed like a dozen times a day. After like 6 or 7 years of use (we got them pre-covid), they still look like new and I regret only buying 2 of them at the time.

Ironically, I haven't actually ever bought a drink at starbucks. I only bought the mugs because I saw them while picking up a Too Good To Go order there one time