Grab a package or two of solid white, light pink or even red paper cups from your local Dollar Store and a package of glitter or felt hearts (also available at most Dollar Stores or craft stores). Use a dab of craft glue and attach the heart to the center of the cup. Allow a few minutes for the heart to set and voila....a cute batch of Valentine's Day cups for adults or kiddos for under $2 (cups sold as sets of 12).
For an extra added touch, use coordinating striped paper straws!