Where can I find/acquire property for flip

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Hi I'm an new to Bigger Pocket and I have recently purchased a small multifamily in Northern Jersey where I currently reside. For my next property, I am thinking about doing fix and hold or fix and selly. I am curious to know where I can usually find good properties to rehab and flip. Should I look in the auction sites?

Also Am I expected to have full cash for most of flip deals? One private lender told me I need 40% equity for privating money lending.