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The closest equivalent is BizQuest, which is nearly identical in scope and pricing and is owned by the same parent company (CoStar/LoopNet) as BizBuySell.
Other general "Main Street" alternatives include BusinessBroker.net and BusinessesForSale.com (strong international reach).
For online-only businesses, Empire Flippers, Flippa, and Acquire.com are the go-to platforms instead.
For larger M&A deals, Axial, DealStream, and Grata serve a more institutional, vetted buyer base. Which type of business you're buying or selling determines which platform fits best.