We used to barter in ancient times, than the trading mode evolved into cash transaction, it shall trend to a cashless society in the future. Deals also have a meaning that is similar to contracts. The earliest deal in China is a land contract that can be traced back 3000 years ago.
Any merchant is suitable to register for .deals！You can design websites such as ‘productname.deals’ to make it clear at a glance. In addition, you can also make good use of related phrases, and register for sites like ‘good.deals’！