Nelson Electronics (2011) LTD - Jaycar Authorised Reseller is an electronics store at 120 Hardy St, listed under Best Island in the Tasman district, with a Google rating of 4.5. Its name says it is an authorised reseller of Jaycar, an Australasian electronics retailer known for components, kits, tools and accessories.
A good electronics store helps you find the right part, and explains how to use it. Bring the part number, a photo or the faulty item, because small differences in voltage, connector type or rating matter. Ask staff about compatibility and safety before buying anything that connects to mains power, and remember that some electrical work must be done by a registered electrician. For hobby projects, ask about starter kits, tools such as soldering irons and multimeters, and which components suit a beginner. Keep receipts, check what is covered by warranty and call ahead to confirm stock. Regulars bring a list, ask for a datasheet where one exists, and buy a few spare components for the project.
For anyone in Nelson fixing or building something, this Hardy St store is a local place to ask.