I just replaced my coffee mug (D'n'D mug) with an Ozark Trail 30oz tumbler. They have 20oz and 40oz too as well as accessories like handles and stickers . The lid seals well but there's no cover for the spout so it's mostly useless. I only use it at my desk so it doesn't bother me. They're inexpensive and have decent insulation. There are many copies of this tumbler but OT has a lifetime warranty (for a cup???). Unfortunately, they're made in China.
https://www.walmart.com/search/?query=ozark trail tumbler&typeahead=ozar
https://www.walmart.com/search/?query=ozark trail tumbler&typeahead=ozar