Stanley Classic Series: Flask, Hammer Tone, 8-Ounce
$32.35 (now $37.40) - Looks like its usually been around $61 (Red version $122 atm)
also available in green for $37.40, I do prefer the color though.
Stanly Master Series: Insulated Flask with Never-Lose Leak Proof Cap for Camping or Daily Use
$48.46 (OOS) - 30c from to all time lowest price according to camel
also available in brown for $6 more but from Amazon US.
The Master Series uses 1mm-thick stainless on all products, while the thickest Classic Series uses 0.7mm.
8oz = 237ml
Personally I just grabbed the Master Series in black, supposedly the thicker stainless makes a difference in longevity terms (although the price difference doesn't really equal that… any way lets not dwell on the past!)