Yes, PRICES is a Scrabble word!

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

Is it a valid word?

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

the property of having material worth (often indicated by the amount of money something would bring if sold)
the amount of money needed to purchase something
value measured by what must be given or done or undergone to obtain something
the high value or worth of something
a monetary reward for helping to catch a criminal
cost of bribing someone
United States operatic soprano (born 1927)

Also: monetary value, leontyne price, mary leontyne price.