Tiny Acquisitions - Tiny acquisitions is the only marketplace for internet business that are priced under $5,000.
MicroAcquire - A free & anonymous startup acquisition marketplace
Microns - Microns.io is a marketplace to discover the best micro-startups for sale.
MicroFounder - It's possible for a solo developer to build a profitable microstartup to pay the bills and live life on their own terms.
SaaSPlace - Acquire, invest & sell SaaS products, plugins and apps
Transferslot - Easily buy and sell side-projects