Where
What: open air market (mostly mom&pop shops selling new stuff; very few antique / collectible / flea market / swap meet stuff; for garage sale-ish swap meet stuff, go across the street
When: Sat/Sun (mostly on sunny days only; many won’t be open in the rain); Closed in Jul/Aug.
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Parking is free. (IIRC, $2 for ‘preferred parking’)
https://ocdeals.ocregister.com/2012/01/01/get-in-free-coupon-for-oc-market-place/156896/