Idioms related to Shopping

Thank God, Christmas is coming!
That means summer, vacation, beach... but before all that, shopping!
Have you shopped for any Christmas presents yet?
Well, to help your English learning, here are some idioms related to shopping:

shop around	If you shop around, you visit a number of shops selling similar articles in order to compare the prices.You can usually save money by shopping around.
shop till you drop	If you shop till you drop, you go shopping for a very long time, until you are exhausted.In Brazil, people usually shop till they drop the day before Christmas.
shopping spree	If you go on a shopping spree, you enjoy a lively outing, usually with much spending of money.Many Brazilias go on a shopping spree as soon as they get their thirteenth salary.
shopping therapy	This term refers to the idea that buying things can make you feel better.A little shopping therapy can usually cheer up some women.
window shopping	When people go window shopping, they look at things in shop windows, without actually purchasing anything.I haven't been paid yet, so I can only go window shopping.