Yes, SPECIALS is a Scrabble word!

Letter values in Scrabble US: S 1, P 3, E 1, C 3, I 1, A 1, L 1, S 1.

Is it a valid word?

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

a special offering (usually temporary and at a reduced price) that is featured in advertising
a dish or meal given prominence in e.g. a restaurant
a television production that features a particular person or work or topic