For a limited time, promotional offers are now available to eligible customers in addition to standard pricing.
The Power Apps per app and per user plans are available for USD3 per user/app/month and USD12 per user/month, respectively.

Per App Users reduced from $10 per user per month to just $3 for 200 or more licences
Per User licence reduced from $40 per user per month to just $12 for 5000 or more licences
More information can be found on the Microsoft site: Pricing – Power Apps (microsoft.com)
1 Promotional pricing is available for commercial offers from December 1, 2020 through June 30, 2021. The Power Apps per app plan is priced at USD3 per user, per app, per month (minimum purchase of 200 licenses) via volume licensing (VL) and cloud solution provider (CSP) channels. The Power Apps per user plan is priced at USD12 per user, per month (minimum purchase of 5,000 licenses) via VL. Other conditions may apply.