Stationery stores: Many physical and online stationery stores sell mechanical pencil parts such as lead, erasers, and grips.
Office supply stores: Office supply stores often carry a wide variety of mechanical pencil parts, including replacement leads and erasers.
Art supply stores: Art supply stores may also carry mechanical pencil parts, especially if they specialize in drafting or technical drawing supplies.
Online retailers: Many online retailers, including Amazon, eBay, and JetPens, offer a wide selection of mechanical pencil parts and accessories.
Specialty pen and pencil shops: If there are specialty pen and pencil shops in your area, they are likely to carry a variety of replacement parts and consumables for mechanical pencils.
Manufacturer's websites: Some mechanical pencil manufacturers may also sell replacement parts and accessories through their own websites.