Yes they sell stamps. You can get them at the registers or customer service. This Walmart is 24/7 with some holiday closings in December/January or inclement weather.
Yes at customer service. But I'm not sure how long customer service is open.
Yes at customer service, which is open until 9pm. Then I believe you can purchase them at aisle 7 until customer service opens in the morning, which I believe is 8am.
Thanks! Your answer is awaiting moderation.