Amazon has 12-Count 16-Oz Mountain Dew Kickstart Caffeine Beverage (Pineapple Orange Mango) for $12 – 5% off when you checkout via Subscribe & Save = $11.40. Shipping is free w/ Prime or orders $25+.
These drinks have an overall rating 4.7 / 5 stars from 15,000+ reviews. Only the Pineapple Orange Mango is slick; the other flavors are $15 and up.