Marketplace for product ideas?

A question to the group,

if i have an idea for a product and have all the UX, branding and spec work completed, but no engineering, how could I go about selling this to somebody or to a company? Is there a marketplace for this type of thing or companies that help product designers sell defined yet unengineered products?'

I"m interested in this type off thing, because I can't say that I'm really interested in starting my own company.

Any ideas?

-Wendy Fischer