The following are local breeders in Southern California area who I personally know and recommend. Please tell them I referred you.
https://www.labastidecavaliers.com/ Big Bear Puppies and stud service
https://www.adorablecavaliersofsoutherncalifornia.com/ Norco - Puppies and stud service
http://www.cordialcavaliers.com/ Agua Dolce - Puppies and stud service
https://mckennacavaliers.com/ Temecula - Puppies
https://casadecavaliers.com/ Pico Rivera - Puppies and stud service
https://carlsbadcavaliers.com/ Carlsbad - puppies and stud service
FurEverAfter Cavaliers 951-547-9242 andrea13ornelas@gmail.com https://www.gooddog.com/breeders/furever-after-cavaliers-california#breed_id=72 Eastvale - puppies and adult rescue.
Becky Dyrdahl 714-876-4269 craigdyrdahl@sbcglobal.net Corona - puppies
Russell Cavaliers (prefer text) 714-472-5698 Marilyncrussell@gmail.com Puppies
Chris and Katie Cavaliers https://ckcavs.com/ Moreno Valley - Puppies blenheim
Magical K9 https://www.gooddog.com/breeders/magical-k9-california Fontana -puppies and stud service
Ronabella Cavaliers, Kerry 310-330-6382 kerry.beaner@gmail.com West LA (near LAX) Puppies
Andrea Garcia, 951-387-0149 Garcia.andrea135@gmail.com Murrieta. Puppies
Jasper Sy 310-889-4180 Jasperpogi21@gmail.com Rancho Cucamonga - Puppies and stud service