To be sure, this is not the cheapest place to get what you need for your home/garden. But if you're going for cost, you're missing the point. Renfrow's offers a different alternative. Not only is it amazingly helpful, friendly service (after all you can get that at Blackhawk which is way more convenient to most Charlotteans), but you're getting a different variety of goods and garden stuff. The main reason I go is to hit their seed section which is the whole front corner of the store. People may wonder why I would drive 35 minutes for seed when Lowe's is 5 minutes away - the seed that Renfrows offers is 10x as good as Burpee traditional seed and Renfrow has a wide variety of heirloom and organic seeds. Their outdoor garden section also has seedlings from squash to tomatoes to tons of different varieties of peppers! Plus you get to see the cute chickens on your way to the seedlings! :)
In addition, they have great soil and compost as well as all the typical hardware stuff you might imagine. As the others mentioned, they also offer lots of nostalgic stuff you find in general stores, etc.
Tip- go early on Saturday mornings and hit the farmers' market next door too!