Sourcing quality Furniture or Lighting Fixtures

[Marshall Swatt]

We've been primarily using Google to search for furniture and lighting fixtures to buy, and struggling to find pieces that we like. I often see items on Instagram and Pinterest that I can't locate online, so perhaps I'm missing some sources?

Looking for suggestions beyond top 20 Google search result sites like Houzz, Etsy, Overstock, Wayfair, Target, Walmart, etc. or Google., and the same for lighting. 

How/where do interior designers source fixtures or furniture, particular for modern furniture or lighting?

Thanks!!!!