The best marketplace depends on your budget and risk tolerance:

: Focuses specifically on custom-built and established niche blogs. Blogs For Sale: Guide, Valuations, Due Diligence

: An M&A firm for high-end, six- to seven-figure acquisitions.

: The largest open marketplace. Good for finding "starter" sites under $5,000, but requires the most intense due diligence as listings are not always vetted.