Tiny Acquisitions - Tiny acquisitions is the only marketplace for internet business that are priced under $5,000.

MyBrocard - Brocard allows you to create an unlimited number of virtual cards for paying for advertising and other online payments, manage a team of buyers, choose from 20+ bins for various tasks, and enjoy convenient API for integrations.

Microns - Microns.io is a marketplace to discover the best micro-startups for sale.

Coinramp - The Coinramp Card lets you ‍spend over 10+ cryptocurrencies like cash, online, in-stores and ATM withdrawals. Available in 100+ countries, no ID needed. Anonymous Crypto Cards

MicroFounder - It's possible for a solo developer to build a profitable microstartup to pay the bills and live life on their own terms.

PST.NET - Virtual payment cards for online shopping and advertising