Hanoi has seen a surge in mobile oyster vans selling grilled oysters at low prices, attracting both diners and pedestrians. Oysters are sold at various price points, from 35,000 to 65,000 VND per kg, depending on size and source. These mobile vendors operate in areas with high foot traffic and sell a large number of oysters every day. However, concerns have been raised about the hygiene of oysters grilled on the sidewalk. The vendors assure that the oysters are fresh and safe to eat, as they are purchased directly from the source and grilled on the spot.