This page has a search and I put in Interior Design and came up with quite a few. It is a world wide site but there were many from America. But in my opinion these jobs go to the lowest bidder usually.
https://www.elance.com/r/contractors...rior%20design/
Architecture, InteriorDesign, Structural
Expert CAD Designer and Licensed Interior Designer
Comprehensive Architecture and Interior Design
Landscape Architect/Map design/Photoshop/2d plans
Landscape Design &Architecture jobs
Landscape Design-Production-Graphics-3d modeling
Landscape designer