Wiktionary
sticker shock
n. (context idiomatic chiefly US English) disgust, shock, or fright upon learning the price of an item offered for sale.
Wikipedia
Sticker shock
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Usage examples of "sticker shock".
When she came back, she was suffering from a kind of sticker shock.
Reacting to the sticker shock, Rumsfeld wondered aloud if there were any way to get other countries to foot some of this bill?