As of 2015, replacement parts for espresso machines can be purchased online at locations including Espresso Zone. Orders can be placed online or by phone.
Espresso Zone carries parts and supplies for espresso machines as well as new espresso units, grinders, cups and mugs, syrups and tea brewing accessories. This company charges a flat-rate shipping for all items.
Another good location that sells espresso parts online is Seattle Coffee Gear. Customers can sign up for a free newsletter to receive special offers and deals by email.
Another location for espresso and coffee machine parts is Goodman's. This site also sells other kitchen appliances and parts.