Here are some searches to help you find Hero's and parts. I have found you have to try them all to find parts. Depending on the wording of the ads, different searches can have very different results. Also, you need to search Titles and descriptions.
General Hero Searches
Heathkit Hero - All of Ebay
HERO 1 Searches:
Heathkit Robot - All of Ebay
Hero 2000 Searches
Hero Jr Searches