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.
MicroAcquire - A free & anonymous startup acquisition marketplace
PST.NET - Virtual payment cards for online shopping and advertising
Tiny Acquisitions - Tiny acquisitions is the only marketplace for internet business that are priced under $5,000.
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
SaaSPlace - Acquire, invest & sell SaaS products, plugins and apps