Yes, DEALERS is a Scrabble word!

Letter values in Scrabble US: D 2, E 1, A 1, L 1, E 1, R 1, S 1.

Is it a valid word?

DEALERS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

someone who purchases and maintains an inventory of goods to be sold
a firm engaged in trading
a seller of illicit goods
the major party to a financial transaction at a stock exchange; buys and sells for his own account
the person who distributes the playing cards in a card game