personal shopper 
noun
An individual who is paid to assist another to purchase goods, either by accompanying them while shopping or by shopping on their behalf.Many higher-end department and specialty stores have personal shoppers to assist you....
- When she didn't respond, I forwarded her articles about people who'd started businesses as party planners, matchmakers, and personal shoppers.
- Consumption has been elevated to an art form, complete with megamalls, personal shoppers and stores that sell containers to hold more stuff.