Yes, sales is a Scrabble word!

Noun

1. Income (at invoice values) received for goods and services over some given period of time

2. A particular instance of selling

3. The general activity of selling

4. An occasion (usually brief) for buying at specially reduced prices

5. The state of being purchasable; offered or exhibited for selling

6. An agreement (or contract) in which property is transferred from the seller (vendor) to the buyer (vendee) for a fixed price in money (paid or agreed to be paid by the buyer)