Bought a 2013 Mazda5 but only got one key
 

I'm guessing "the key" problem gets posted a lot and I tried a search and didn't get a specific answer to my question so I apologize in advance for my newcomer question.
Long story short, only received one key/remote with the car and we would like to have at least one backup.
Is our only option to pay the dealer $200-$300 for a flip out key blank and have them cut and programing?
I see the flip out key blanks on eBay for $30-$50 but I presume the dealer will refuse to cut/program them so they can get there +/- $120 for the blank key fob (plus the cost of cutting and programing)?


Thanks in advance