Good tools are worth keeping, and worth keeping sharp. There are a variety of possible sources for this service, including — yes — hardware stores, handyman businesses, and tool repair and lawn mower repair shops. Some services will come to you; others require you to bring implements to them. Among items that benefit from occasional sharpening are scissors, knives, garbage disposals, lawn mower blades, pruners, hedge shears, shovels, hoes, grass clippers ...