sbwh.xyz is Superbuy's warehouse sale page. You can buy items that have officially been "destroyed" by being abandoned in the warehouse for more than 180 days. It's safe to assume that most of them were forgotten or that the original buyer couldn't afford shipping, flaws are the exception.
Discounts tend to range between 75% and 90%. That's a big discount for items that are technically in new condition. The only downside is that you just can't pick the size, you get what you see.
The items are purchased through Superbuy, you can pay with any payment method you like.