How much is Pocket WiFi?

I'm curious to know, just how much does a Pocket WiFi device typically cost? With the increasing demand for on-the-go internet connectivity, I'm wondering if these devices have become more affordable. Are there different price ranges depending on the brand, features, or speed of the Pocket WiFi? Also, is it a one-time purchase or do users need to pay for additional data plans? Understanding the costs associated with Pocket WiFi would help me make an informed decision on whether to invest in one for my own personal use.