So umm my key broke. How do I fix/replace this?

[Pocky]

It's cracked where it holds the key. I have a spare and this one still works but I'd rather replace it before I need it or if I lose the other key. I know the key part can be removed from the remote part, but is it as simple as getting a new key key blank and replacing it?

[Pocky]

I forgot to mention it's a 2011

[2012mazda3hatch]

To get a new key from the dealer is about 400$ for the fob and the key to be programmed. When this happened to me I just went to Canadian tire and got them to cut me a new one. Some locations now do chip keys and I haven’t had any issues with it.

[S.F.W.]

Buy a replacement fob used on eBay or similar. Then have a dealer cut and insert cut key into fob you bought online.
You can program the key yourself since you have two keys already programmed.

[KaylaHeart]

It Looks like you just broke the fob i'd see if you could find one similar and change out the broke fob part.

[McGuyver_3]

you can buy the blade portion separate from the remote portion

example, click it

They should be in the 50$ range at the dealer from what I remember. I don't suggest that ebay link, just using it as an example

[Flunk]

Were it me, I'd first try taking the key apart and gluing the broken plastic back together. Use either a plastic specific epoxy or if you can't find that the super glue will hold ok for a spare key. It should continue to work properly provided the plastic part clears the housing

[kingkhan]

Not sure if you replaced the key yet, but you can buy the blade off of ebay for around $5. You can get the blade cut and replace it yourself.