Tips to Find Businesses For Sale

I sold my first business earlier this year and eager to become a business owner once again (corporate america sucks). Instead of another start-up I am interested in purchasing an existing business. How would you recommend identifying an existing business for potential sale? Even if the business is not posted for sale.

Yes I know the typical websites with business for sale but ideally I can find a local boomer looking to retire. I've exhausted my inner network circle and need to find new leads.

I'm considering joining local Chamber of Commerce and extending my network. Thoughts?

Thanks for reading