There's no way your grandma bought two Stanley brand cups for $5. I've been using a Stanley pint glass for years, and if I put ice water in at at night, there will still be ice in it in the morning. It's vacuum insulated.

$45 for a 30 or 40 oz cup with a straw is too much because there are cheaper brands that do the same thing for half the price.

You will have to pull my 40 oz insulated cup out of my cold dead hands. Waking up in the middle of the night in the summer thirsty and being able to sip on water that's still ice cold from 8 hours ago is so nice!