Low-Cost $99 Pocket Router with 2x1GbE and 2x2.5GbE Ports (linuxgizmos.com)

But will it run pfsense?

The CPU in that thing gets a 1,197 passmark rating.

Aliexpress has Intel N100 barebones fanless units with 4x2.5G ports for $117

Passmark rating on the N100 is 5,556.

So ... 4-5 times faster, for 20% more.