I'd check the dealer price first. With all the cheap replacements they were getting killed, many have come back to near earth on prices. I've heard several complaints about the aftermarket cheapies. I NEVER found an inexpensive way to get the physical key that fits the fob replaced.

My second choice would be to check eBay for a genuine OEM unit. My local dealer reprogrammed ours for free, regular price was $20.00 back in 2018. My '16 300 only came with one fob so I only gave them one for the '13 I traded, that's the one I had reprogrammed. 4+ years later, no problems at all.