Where can I buy a spare tire replacement?

Last week I blew a tire on my car and used the space saver spare that came with my 2014 Ford Focus. I drove about 50 to 70 miles on it until i replaced it 2 days ago and the tire place I went too put the spare back. Id rather replace it in case i blow another tire because I think I used all the life out of the spare.

To be honest, you probably be able to drive on that spare another 1,000 miles before you need to think about changing the actual tire. They do last longer then you think

Heck, you may get rid of the car before wearing out the spare tire to be honest. They do last for a long time

The space saver? I.d try an auto salvage yard,… They ought to be cheap,… MANY never get used

No you didn't.

Why would you think you used "all the life in the spare"? On what basis do you assume that?

Is the tire bald?

Does it have steel belts poking through?

I'm guessing probably not.