Just a data point. I needed a replacement portafilter rest/fork for my rocky doser. Prices O/S ranged from $US5 to $10
The Coffee Machine People (Melbourne) - $37 plus $12.50 postage - total $49.50
Coffee A Roma (Melbourne) - $10 plus $5 postage - total $15.
Both responded promptly and politely to emails, but guess which one I went with.