I remember going to Grace Brothers and Dick Smiths seeing A500s front and center of their computer departments. There was also a stack of smaller businesses producing hardware - for example, I purchased an Aussie designed and built eeprom programmer (which allowed duplication of Apple roms and Amiga roms). There was of course Opal Vision.
We also had stacks of small businesses selling hardware and software - both retail and mail order. We even had our own Amiga Mags and back in the day there were Amiga clubs almost everywhere.