be a bargain hunter
be a compulsive shopper
have buyer’s remorse
go window-shopping
make an impulse buy
bid on an item
go on a shopping spree
go over your credit limit
be unable to control your need to buy things
have regrets after making an unwise purchase
spend lots of money shopping for pleasure
offer money to buy an item at an auction
be a person who looks for low-priced products
charge more to your credit card than the allowed amount
look at goods in stores without buying any
buy something suddenly without having planned to