Where can I get a Spare Key Fob?

How about your local Mazda dealer; they'll also be able to programme key to vehicle, or an auto electrician with suitable coding equipment.
 
I ran my 2021 CX-5 key FOB through the washing machine. After I opened it up to expose the guts and let it dry for 24 hours, it worked one week then crapped out. A new one with programming was over $500 at my local Mazda dealer. I bought an OEM key FOB from a local battery place (sells automotive and all other types of batteries). With programming, it was $310. You can buy OEM-looking FOBs on Amazon for under $50, but you’d have to get someone to program it.
 
Do you go to the tire center at your costco to talk about new keys?
Google for Car Keys Express. It was a van parked in front of Costco when I overheard the rep talking to another customer. I had been having an annoying issue with the OEM where the signal is weak and the car would pick up my wife’s fob but not mine if she’s standing outside and I’m sitting in the driver’s seat.
 
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