Cost Plus: World Market is the best place to look for mugs. They have quite a selection: very simple white diner mugs, oversized (16oz) and stacking mugs (in addition to many more stylized and/or novelty mugs).
13 oz perfect standard mugs:
White Porcelain Coupe Mugs Set Of 4
The classic style, bright white glossy finish and elegant simplicity of our Coupe mugs from Thailand make them instant go-to pieces for everyday meals and entertaining. Whether you pair them with colorful patterns or solid neutrals, you'll always set an inviting table with these new dining essentials.
16 oz mugs:
White Textured Stoneware Mugs Set of 4
Bring a casual cafe vibe to your table setting with our stoneware mugs. In four textured designs, these off-white mugs are beautiful on their own or mixed with other dinnerware for an eclectic flair.
White Stacking Cups Set of 6
Cupboard space a tight squeeze? These white diner-style stacking mugs and espresso cups are just the fit you need. Each set of six comes with its own black powder-coated rack so you have the option of countertop storage, and the demitasses come with matching saucers for the complete espresso-sipping experience.
12oz stacking mugs
Natural White Porcelain Stacked 4 Piece Mug Set
Nesting neatly in a stack to save space and streamline your cupboards, our off-white glazed mug set is a timeless everyday choice that's perfect for small-space living. Crafted of porcelain with a modern silhouette, they make a great housewarming gift or an extra set for entertaining.
They even have Irish coffee mugs!
Irish Coffee Mugs Set of 6
Irish eyes are smiling. Especially when they're getting warmed up with a cup of Irish coffee. Any gourmet coffee or tea toddy is well-served in this set of clear glass mugs with great stem detail.