According to an article from The Huffington Post, Dollar General does not sell bags of ice.
This article reports that Dollar General is one of a number of grocers that have discontinued the sale of ice bags. The article cites a study that found that people are using less ice due to increased awareness of the environmental impact of using ice.
The article speculates that the disappearance of ice bags may be due to the increase in the sale of reusable containers and ice packs. It concludes that while Dollar General may not be the only store that has discontinued the sale of ice bags, the trend may be indicative of a larger trend of consumers using less ice overall.