Market place is down?

went to buy the new 737 … marketplace is down? Is that where i’d buy it?

If you’re referring to the PMDG 737, it is only available direct from the manufacturer. It won’t be on the Microsoft Flight Simulator Marketplace for a while.


where are people getting the free credit to buy it ?

That would be on the pmdg website:
The credit (if your account applies for it based on your past purchases) was automatically applied to your account