In convenience store beverage coolers, or cold vaults, owners are seeing an increase in the sales of healthy refreshments, including beverages that are natural, organic and low in calories, according to CSP Daily News. C-store owners are reporting sales boosts of 18 to 25 percent for the better-for-you (BFY) drink category, cites the source. The trend is towards higher-end BFY drinks with prices from $1.20 to $6 including enhanced waters, premium juices and smoothies.