Seems like Moderna had some shipping issues early on, and it only recently got approved for younger ages, so lots of places only had the Pfizer one.

We were running into a similar issue.

We haven't gotten it yet due to Pfizer being the only one available near me for a while now. I figured we could stand to wait a bit longer for Moderna.

Thanks to this posting reminding me about it, I just looked again and found some places near me that had it. I have an appointment for Saturday for all three of us.