2. Be wise and know the places where real designer handbags are sold. All famous brands have their own stores. Some have the same name as the brand. In some instances designer handbags can be sold in a quality store or a boutique or a luxury department. The people who are selling bags should know it all about the quality, pedigree and guarantees. Be cautious if someone is trying to sell designer bags at a flea market. Be suspicious of street vendors. Street vendors are not authorized to sell designer purses or bags. Finding a cheap designer purse at a flea market is close to impossible yet it sometimes happens.