Hi @sabarishn ,
The license of PowerApps P1 and P2 are all previous licenses, which have been abandoned.
If you want to purchase powerapps license, you need to purchase current license.
Here are some licenses that you may would like to purchase:
1)some Office 365 licenses include PowerApps
These Office 365 licenses include PowerApps:

These licenses support these functions about powerapps:

Some advanced are not supported by using these licenses, such as CDS, gateway, premiun and custom connectors.
2)powerapps standalone license
We have two kinds powerapps standalone license now:
Power Apps per app plan, Power Apps per user plan .
The supported functions are:


The pricing is:

So please choose licenses based on your demands.
You could refer these in details:
licenses overview: https://docs.microsoft.com/en-us/power-platform/admin/pricing-billing-skus
licenses pricing: https://powerapps.microsoft.com/en-us/pricing/
Best regards,