Can you buy authentic designer bags cheaper? Yes! Take a look at the Bagaholic preloved designer bags store https://lvbagaholic.com. These guys sell 100% authentic bags from Louis Vuitton, Chanel, Hermes, Gucci, Dior and all these jet-setting brands at 30-90% discount from the retail price.
Generally, the prices start at $400 but you can find a lot of accessories below this benchmark.
I love that they pay so much attention to the authenticity of the bags they sell.
They also have an amazing Instagram page with reviews of luxury bags. Check it out here: https://www.instagram.com/lv_bagaholic/