Zojirushi Stainless Steel Mug, 20 ounce, Black Matte $27.49(price dropping)
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Model: Stainless Mug SM-SHE60
https://www.zojirushi.com/app/product/smshe
Capacity 20 oz. / 0.60 liter
Dimensions (W x D x H)2-3/4 x 2-7/8 x 9-7/8 inches
Weight (lbs. oz.)0.10
Heat Retention*189F @ 1 hr. / 162F @ 6 hrs.
Cold Retention**46F @ 6 hrs.
Matte Black (-BZ)
This is non-coated, "slicksteel interior" as Zojirushi calls it.
There are many other models that have been cheaper than this but usually those are nonstick coated.
If you prefer non-coating like I do, this is close to the lowest price per CCC.
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